So your boiler is flashing and it's showing a random set of numbers and letters? This is an error code, and each error code is specific to the error. So, on this page we have compiled a database of almost every mainstream boiler and their error codes. Have a look to see if you can find your one, you may save yourself some time and money before arranging for a callout. If you cant find your error code then give us a call.
Worcester Bosch CDI Classic Combi Boiler Error Codes |
|
Fault Description | System Behaviour |
A1 | Water is leaking or the pump needs replacing or freeing due to the pump running dry. |
A7 | The hot water negative thermistor coefficient (NTC) sensor is defective – the hot water sensor or connecting leads need checking. |
A8 | Break communication to FX sensor controls electrical connections need checking. |
B1 | Code plug not detected . |
C6 | Fan speed too low – the fan lead and connector need checking and may need replacing. |
E2 | Central heating (CH) water flow negative thermistor coefficient (NTC) sensor defective check CH flow NTC sensor and connection leads. |
E9 | Safety temperature limiter in central heating (CH) flow has tripped the system pressure or safety temperature limiter needs checking |
EA | Flame not detected due to a gas issue – the gas supply, power supply or igniter, electrode and lead need checking – contact a Gas Safe installer. |
F0 | Internal error – electrical connector contacts or programmer interface module – check ignition leads are not loose. |
F7 | Flame detected even though the appliance is switched off – check the electrode assembly is dry and the pcb and flue are clear. |
FA | Flame detected after gas shut off – the gas valve needs checking – hire a Gas Safe installer. |
FD | Reset button pressed by mistake – press reset button again. |
Worcester Bosch CDI Highflow Combi Boiler Error Codes |
|
Fault Description | System Behaviour |
A1 | Pump dry run detection or pump is running in air the system pressure needs checking |
A5 | Tank negative thermistor coefficient (NTC) defect |
A7 | Domestic hot water (DHW) negative thermistor coefficient (NTC) defect |
A8 | Energy Management System (EMS) communication error |
B1 | Code plug not detected |
B2, B3, B4, B5, B6 | Data error |
B7 | Burner control error |
C6 | Fan defect |
D3 | External temperature limiter |
D5 | Condensate pump failure |
D6 | Internal heat bank overflow |
EA | Flame not detected |
E2 | Primary negative thermistor coefficient (NTC) defect |
E9 | Safety temperature limiter in central heating (CH) flow stat tripped |
F0 | Internal error |
F1 | ROM fault |
F7 | Flame detected after appliance has been shut off |
FA | Flame detected after gas shut off |
FD | Reset button pressed – try pressing the reset button again |
Worcester Bosch CDi Compact / Greenstar 25/30 Si Combi / Greenstar 27/30 I system Boiler Error Codes |
|
Fault Description | System Behaviour |
T1 | Ignition test – checking the igniter spark |
T2 | Fan test – checking the basic fan |
T3 | Pump test – checking the basic pump |
T4 | Three way valve test |
T6 | Ionisation oscillator test |
9A 362 | error – incorrect HCM fitted |
9U 233 | Heat Control Module (HCM) error – problem with code plug |
B7 257 | Internal error – possible control board problem |
C6 215 | Fan problem – fan running too fast |
C7 214 | Fan problem – fan not running |
D1 240 | Return sensor error – sensor may be wet or damaged |
E2 222 | Flow sensor short circuit error |
E5 218 | Flow temperature too high |
E9 219 | Safety sensor fault – temperature too high, sensor short circuit or open circuit |
EA 227 | No flame detected or flame signal loss during operation |
F0 237 | Internal error |
F7 228 | Flame error – false flame or flame detected before burner started |
FA 306 | False flame fault – flame detected after burner stop |
FD 231 | Mains power fault – electrical power interruption |
FA 364 | Gas valve EV2 leak test failed – gas valve leak |
FB 365 | Gas valve EV1 leak test failed |
A1 281 | Pump stuck or running with air in the system |
C1 264 | Airflow stopped during operation |
C4 273 | Airflow present during last 24 hour |
D1 240 | Return sensor short circuit |
D4 271 | Temperature difference between flow and safety sensor exceeds limit |
E9 224 | Max thermostat activated – flue gas thermostat overheat |
EA 227 | No ionisation detected after ignition |
EF 349 | Central heating boil detected – boiler operating at minimum burner load with temperature difference greater than 18°C between Flow & Return. |
NO CODE 212 | Safety or flow temperature rising too fast |
Worcester Bosch CDi Classic Regular Boiler Error Codes |
|
Fault Description | System Behaviour |
B1 | Code plug not detected |
C6 | Fan speed too low |
E2 | Central heating (CH) flow negative thermistor coefficient (NTC) sensor defective |
E9 | Safety temperature limiter in central heating (CH) flow has tripped |
EA | Flame not detected |
F0 | Internal error |
F7 | Flame detected even though appliance switched off |
FA | Flame detected after gas shut off |
FD | Reset button pressed by mistake |
Worcester Bosch Greenstar I System / Combi Boiler Error Codes |
|
Fault Description | System Behaviour |
226 | Service tool has been connected in the blocking error history menu |
FD 231 | The power has been interrupted during a lockout |
C7 214 | Fan does not run during the start up phase – fan harness connector needs checking |
C6 215 | Fan speed too high – check the fan harness and connector |
C7 216 | Fan speed too low – check the fan harness and connector |
C7 217 | Fan has stopped during appliance operation |
C1 264 | Fan stopped during operation |
C4 273 | Continuous fan operation for the last 24 hours – appliance temporarily blocked |
E2 222 | Flow temperature sensor shorted |
E2 233 | Flow temperature sensor disconnected |
E9 276 | Primary flow temperature exceeded 95°c |
E2 350 | Flow temperature sensor shorted |
E2 351 | Flow temperature sensor disconnected |
FA 306 | Ionisation detected after the gas valve closed |
EA 227 | No ionisation detected after ignition |
F7 228 | Isioniation current detected before burner start |
EA 229 | Loss of ionisation signal during operation |
EA 261 | Heat control module (HCM) potentially defective – reset the appliance |
9U 233 | Control box or heat control module (HCM) is defective or loose, the HCM needs to be checked |
C4 237 | Control box or heat control module (HCM) is defective |
F0 238 | Gas valve or control box error – gas valve coils need checking |
F0 239 | Control box or the heat control module (HCM) is defective – the control box connections need checking |
F0 242 | Control box or the heat control module (HCM) is defective – the HCM and control box connections need to be checked |
B7 257 | Control box or the heat control module HCM) is defective- the HCM and control box connections need to be checked |
F0 258 | Control box or the heat control module (HCM) is defective – HCM or control box connections need to be checked |
EH 258 | Control box or the heat control module (HCM) is defective – HCM or control box connections need to be checked |
F1 259 | Control box or the heat control module (HCM) is defective – HCM or control box connections need to be checked |
F0 262 | Control box or the heat control module (HCM) is defective – HCM or control box connections need to be checked |
F1 263 | Control box or the heat control module (HCM) is defective – HCM or control box connections need to be checked |
F0 272 | Control box or the heat control module (HCM) is defective – control box and connections need checking or HCM might not be inserted properly and need replacing |
F0 280 | Control box or the heat control module (HCM) is defective – control box and connections need checking or HCM might not be inserted properly and need replacing |
F0 290 | Control box is defective – HCM needs checking as it might not be inserted properly or need replacing |
328 | Internal error with the mains voltage – frequency may be inconsistent |
235 | Incompatible heat control module (HCM) software versions – control box needs latest software |
356 | Low mains voltage – the voltage may be interrupted or inconsistent and needs checking |
360 | Heat control module (HCM) invalid – the inserted HCM does not correspond with the control box |
A8 362 | Low mains voltage – the voltage may be interrupted, inconsistent or heat control module (HCM) invalid |
CC 800 | Outdoor sensor defect available when accessory outdoor sensor is connected |
A1 281 | Pump stock or running dry |
E9 224 | Flue or high limit thermostat activated |
D4 341 | Primary flow temperature rising too fast |
Worcester Bosch GB162 Boiler Error Codes |
|
Fault Description | System Behaviour |
208 | The boiler is in chimney sweep mode |
200 | The boiler is in heating mode |
201 | The boiler is in domestic hot water (DHW) mode |
202 | The boiler is waiting – there was a heat demand from the on off or modulating control |
203 | The boiler is on standby |
204 | The boiler is waiting – the actual temperature is higher than the calculated or selected boiler temperature |
212 | The temperature recorded by the flow temperature sensor or the safety sensor is rising too quickly |
226 | Diagnosis tool was connected and is now locked out |
260 | The flow temperature sensor is not detecting a rise in temperature following a burner start |
265 | The boiler is waiting in response to a heat demand – the boiler regularly switches to partial load |
268 | Component test phase |
270 | The boiler is modulating upwards |
283 | The boiler is preparing for a burner start – the fan and pump are activated |
284 | The gas valve is switched |
305 | The boiler is waiting for domestic hot water (DHW) operation to end |
235 | The KIM (boiler identification module) is too new for the burner control unit |
360 | The KIM that has been fitted is not compatible with the burner control unit |
9A 361 | The burner control unit that has been fitted is not compatible with the KIM (boiler identification module) |
9U 233 | The burner control unit or KIM (boiler identification module) is faulty |
A3 317 | Short circuit in the flue gas temperature sensor contacts |
B7 257 | The burner control unit or the KIM (boiler identification module) is faulty |
C1 264 | No control signal or power supply to the fan during operation |
C4 273 | The boiler was switched off for a maximum of 2 minutes because it had been operating continuously for more than 24 hours |
C6 215 | The fan speed is too high |
C6 216 | The fan speed is too low |
C7 214 | The fan does not run during the start phase |
C7 217 | The fan speed is irregular when starting up |
CE 207 | Water pressure is too low |
CE 266 | Pump test failed |
D1 240 | The contacts of the boiler return temperature sensor have been short circuited |
D1 241 | The contacts of the boiler return temperature sensor have been interrupted |
D3 232 | The external switching contact has opened |
D4 213 | The actual temperature recorded by the flow temperature sensor or return temperature sensor is rising too quickly |
D4 271 | Actual temperature differential between flow and safety temperature sensor is too high |
D4 286 | The boiler return temperature sensor has detected a return temperature higher than 105°c |
E2 222 | Short circuit in the flow temperature sensor contacts |
E2 223 | The flow temperature sensor contacts have been interrupted |
E5 218 | The temperature captured by the flow temperature sensor exceeded 105°c |
E9 210 | The temperature measured by the flue gas sensor is too high and is open |
E9 219 | The safety temperature sensor has captured a temperature in excess of 105°C |
E9 220 | The contacts for the safety temperature sensor have shorted or the safety temperature sensor has detected a temperature higher than 130°c |
E9 224 | The contacts of the safety temperature sensor have been interrupted |
E9 276 | The temperature flow sensor has measured a temperature in excess of 95°c |
E9 277 | The safety temperature sensor has measured temperature in excess of 95°c |
E9 285 | The boiler return temperature sensor has measured a temperature higher than 95°c |
E9 318 | The flue gas temperature sensor contacts have been interrupted |
EA 227 | An insufficient ionisation current was measured following ignition of the burner |
EA 229 | The ionisation current detected by the system during the burning phase was insufficient |
EA 234 | The contacts of the gas valve have been interrupted |
EA 261 | The burner control unit is faulty |
EA 269 | The ignition device has been activated for too long |
F0 238 | The burner control unit KIM (boiler identification module) is faulty |
F0 239 | The burner control unit KIM (boiler identification module) has an error. Cabling might have poor contact breaks and pinching or the plug and wiring of the burner control unit needs checking, also check the operating characteristics of the boiler by replacing the burner control unit. |
F0 242, F0 243. F0 244. F0 245, F0 246. F0 247, F0 248, F0 249, F0 250, F0 251, F0 252, F0 253, F0 255, F0 259, F0 263, F0 267, F0 272 |
The burner control unit (KIM) is faulty – the wiring of the burner control unit needs checking, also check the operating characteristics of the boiler by replacing the burner control unit. |
F0 278 | The sensor test has failed – cabling and plug sensors need checking |
F0 279 | The burner control unit, or KIM, is faulty – control unit may need replacing |
F0 280 | The burner control unit is faulty |
F0 287 | The burner control unit, or KIM, has an error |
F0 290 | The burner control unit, or KIM, is faulty |
F7 228 | An ionisation current was measured before the burner started |
F7 328 | A brief power failure has occurred |
FA 306 | An ionisation current was measured after the burner went out |
FD 231 | The mains voltage was interrupted during an interlocking fault |
EC 256 | The burner control unit has an error |
EH 258 | The burner control unit is faulty – check the plug and wiring of the burner control unit. |
H07 | The current water pressure is too low, limiting the performance in heat mode as well as domestic hot water (DHW) mode |
HrE | The boiler keeps resetting |
rE | The boiler resets |
Worcester Bosch CDI Highflow Combi Boiler Error Codes | |
A light on your boiler will flash to indicate that there is a fault. Depending on the type of fault, the light will flash in a different sequence. | |
There will be 4 quick flashes followed by a 5 second gap when the light is off and finally a series of longer flashes. The number of long flashes tells you which fault the boiler has. | |
Fault Description | System Behaviour |
Light off | No boiler demand |
Light on | Heating demand on boiler is OK |
1 flash 5 seconds off | No ionisation detected after ignition |
2 flashes 5 seconds off | Loss of ionisation signal during operation |
3 flashes 5 seconds off | Gas valve error |
4 flashes 5 seconds off | First safety timing error / ignition timing error |
5 flashes 5 seconds off | Ionisation detected after burner stopped Gas valve EV2 leak test failed Gas valve EV1 leak test failed Ionisation current detected before burner start Gas valve error Ionisation sensor shorted |
4 flashes 5 second gap 1 long flash | Sensor test failed |
4 flashes, 5 second gap, 2 long flashes | Safety temperature too high |
4 flashes, 5 second gap, 3 long flashes | Max safety thermostat activated |
4 flashes, 5 second gap, 4 long flashes | Return temperature too high |
4 flashes, 5 second gap, 5 long flashes | Flow temperature too high – supply sensor exceeded 110°c |
1 long flash, 4 quick flashes, 5 second gap, 1 long flash, 4 quick flashes |
Heating control module (HCM) defective |
2 long flashes, 4 quick flashes, 5 second gap, 2 long flashes, 4 quick flashes |
Fan running too fast Fan running too slow No airflow after defined period of time Fan not running |
3 long flashes, 4 quick flashes, 5 second gap, 3 long flashes, 4 quick flashes |
Mains voltage interrupted after locking error |
4 long flashes, 4 quick flashes, 5 second gap, 4 long flash, 4 quick flashes |
Internal control board faults |
5 long flashes, 4 quick flashes, 5 second gap, 5 long flash, 4 quick flashes |
All other miscellaneous faults – reset the boiler by turning the control knob anti-clockwise to the reset position |
Worcester Bosch Greenstar Ri Boiler Error Codes | |
Fault Description | System Behaviour |
No light | No power at control board |
Light on | Appliance on but not operating during demand |
Slow flash ( mostly off flashes on) | Ignition lockout |
Slow flash ( mostly on flashes off) | Flue overheat or heat exchanger overheat |
Fast flash | Volatile lockout sensor fan or code plug |
2 pulses | Check service mode switch is in minimum position |
5 pulses | Check service mode switch is in max position |
Worcester Bosch Error Code EA 229 or D5 | |
If you’re seeing the error code EA 229 or D5 on your Worcester Bosch boiler, this means that the condensate pipe is frozen. This happens due to the condensate pipe running outside, however this is an issue that you could fix yourself if you feel confident enough, you can find out how in our handy guide. |
Glow-worm Boiler Error Codes |
||
Boiler Model | Fault Code | Cause of Problem |
Betacom | Red LED on | Lockout – low water pressure (increase pressure to 1.5bar) and reset boiler |
Betacom | Red LED flashing | Overheat – check both overheat stats |
Betacom | Yellow LED flashing | Turn domestic hot water (DHW) control knob into temperature range and turn central heating (CH) temperature control knob into power (reset position) and wait for minimum of 30 seconds before turning into either summer or temperature position |
Betacom | Yellow LED on | Flame present on the burner |
Betacom | Green LED on | Boiler ready for operation |
Betacom | Green LED off | No power to boiler – Check for 230volts into the appliance, check fuse on printed circuit board (PCB) |
Betacom / Ultracom₂ cxi / sxi / 35 | F00 / F10 / F71 | Flow heating temperature sensor fault |
Betacom / Ultracom₂ cxi / sxi / 35 | F01 / F11 | Return heating temperature sensor fault |
Betacom / Ultracom₂ cxi / sxi / 35 | F20 | Overheating fault |
Betacom / Ultracom₂ cxi / sxi / hxi / 35 / Flexicom cx / hx / sx | F9 / F22 | Low water pressure (or ignition temperature rise too slow) |
Betacom / Ultracom₂ cxi / sxi / 35 | F26 / F77 | Fault in gas valve |
Betacom / Ultracom₂ cxi / sxi / 35 / CI / hxi / Xtramax HE | F27 / F16 | Flame detection fault |
All Boilers | F28 / F1 / F4 | Ignition fault (flame detection) |
Betacom / Ultracom₂ cxi / sxi / 35 | F29 | Loss of flame during operation |
Betacom / Ultracom₂ cxi / sxi / 35 | F32 | Incorrect air pressure |
Betacom / Ultracom₂ cxi / sxi / 35 | F49 | EBUS voltage fault |
Betacom / Ultracom₂ cxi / sxi / 35 | F61 / F62 / F63 / F64 / F65 / F67 | Fault in the main board |
Betacom / Ultracom₂ cxi / sxi / 35 | F68 | Fluctuation of flame signal |
Betacom / Ultracom₂ cxi / sxi / 35 | F70 | User interface incompatible with the main board |
Betacom / Ultracom₂ cxi / sxi / 35 | F72 / F84 | Permanent temperature difference between flow and return heating sensors |
Betacom / Ultracom₂ cxi / sxi / 35 | F73 / F74 | Heating circuit pressure sensor fault |
Betacom / Ultracom₂ cxi / sxi / 35 | F76 | Thermal fuse fault |
Betacom / Ultracom₂ cxi / sxi / 35 | F83 | Thermal fuse fault |
Betacom / Ultracom₂ cxi / sxi / 35 | F85 | Flow and Return heating sensor fault |
Betacom / Ultracom₂ cxi / sxi / 35 | F86 | Underfloor heating contact fault |
All Boilers | ERR / F12 / F18 | User interface fault |
Betacom c | Temperature 30 flashing | Fault on central heating (CH) thermistor |
Betacom c | Temperature 40 flashing | Fault on DHW thermistor |
Betacom c | Temperature 50 flashing | Fault on outside sensor |
Betacom c | Temperature 60 flashing | Low system pressure |
Betacom c | Temperature 70 flashing | Fault on APS |
Betacom c | Temperature 80 flashing | Overheat open circuit |
Betacom c | Temperature 90 flashing | Flame or gas failure |
Compact e / s | No DHW | Check dhw microswitch / Check external controls, Please test for 230V on switch live contact |
Compact e / s | No C/H | Check dhw microswitch if dhw demand led is lit / Check external controls, Please test for 230V on switch live contact |
Compact e / s | No C/H but boiler is firing | Check diverter motor and cartridge / Check external controls, Please test for 230V on switch live contact |
Compact e / s | Boiler locks out within 10 seconds | Check pump proving switch, air pressure switch and overheat state / Check pump proving switch, air pressure switch and overheat stat |
Compact e / s | Poor burner pressure | Check burner pressure/ignition adjustment pots on PCB |
Ci Range (plus) / Si range | F2 | Fan/APS |
All Boilers | F5 | Overheat Fault |
All Boilers | F6 | Central heating flow thermistor |
All Boilers | F7 | Domestic hot water thermistor |
All Boilers | F8 | Tank thermistor fault |
sxi / si / ci (plus) range / Xtramax HE | F9 | Water pressure sensor fault (please contact GW technical department for further information) |
All boilers | F10 | Central return flow thermistor |
All boilers | F11 | Main board connection fault |
Ci (plus) / cxi / hxi / si / sxi range | F12 | Connection fault between main printed circuit board (PCB) and display PCB |
Ci (plus) / cxi / hxi / si / sxi range | F13 | Main PCB connection fault |
Ci (plus) / cxi / hxi / si / sxi range | F14 | Central heating flow temperature > 95 degrees |
Ci (plus) / cxi / si / sxi range | F15 | Gas valve stepper motor fault |
Ci (plus) / cxi / hxi / si / sxi range / Xtramax HE | F17 | Power supply is less than 170v |
Ci (plus) / cxi / hxi / si / sxi range / Xtramax HE | F19 | Central heating thermistor unplugged |
Ci (plus) / cxi / hxi / si / sxi range / Xtramax HE | F20 | Software incompatibility |
cxi / hxi / sxi range / Flexicom cx | F24 | Central heating return temperature > 90 degrees |
cxi / hxi / sxi / Xtrafast 96/120 / Xtrafast 96/120E1 | F25 / F26 / F11 | Poor circulation |
ci range | F3 | Air fault |
ci range | F3 | Air fault |
cxi / sxi / hxi range/ Xtramax HE | F2 / F3 | Fan |
cxi / sxi range / Flexicom cx / hx / sx / hxi / Ultracom cxi / cx / hxi / sxi / Ultrapower sxi |
F3 | Fan unable to reach ignition speed |
Flexicom cx / hx / sx / hxi / Ultracom cxi / cx / hxi / sxi | F9 | Water pressure sensor fault, blocked flow filter or pump fault |
Flexicom cx / hx / sx | F11 | Flow and or return thermistor fault |
Flexicom cx / hx / sx / Ultracom cxi / cx / hxi / sxi / Xtramax HE | F13 | PCB memory or sensing fault |
Flexicom cx / hx / sx / Ultracom cxi / cx / hxi / sxi / Xtramax HE | F14 | Gas valve control defective |
Flexicom cx / hx / sx / Ultracom cxi / cx / hxi / sxi / Xtramax HE | F15 | E-bus voltage failure |
All boilers | F25 / F23 | Circulation fault |
Flexicom cx / hx / sx / Ultracom cxi / cx / hxi / sxi | F43 | Generic error |
Flexicom cx / hx / sx / Ultracom cxi / cx / hxi / sxi | F70 | Software incompatible |
Flexicom cx / hx / sx / Ultracom cxi / cx / hxi / sxi | F73 | Unable to see pump activate |
Flexicom cx / hx / sx / Ultracom cxi / cx / hxi / sxi | F77 | Condensate pump error (optional) |
hxi range | F9 | Earlier models only (please contact GW technical department for further information) |
hxi range | F9 | Earlier models only (please contact GW technical department for further information) |
Ultracom₂ 35 Store | F02 / F12 | Hot water temperature sensor fault |
Ultracom₂ 35 Store | F03 / F13 / F79 | Storage tank temperature sensor fault |
Ultracom₂ 35 Store | F81 | Overheating of hot water circuit |
All Ultracom | No display or Er | loose connection X51 |
Xtramax HE Range | F24 | Cental heating return temperature > 90 degrees |
Xtramax HE Range | F25 | Maximum temperature rise slope |
Xtramax HE Range | F26 | Maximum delta temperature |
Xtrafast 96/120 Range | F00 | No fault/td> |
Xtrafast 96/120 Range / Xtrafast 96/120E1 Range | F00 | No fault |
Xtrafast 96/120 Range / Xtrafast 96/120E1 Range | F02 | Air flow fault |
Xtrafast 96/120 Range / Xtrafast 96/120E1 Range | F05 | Overheating |
Xtrafast 96/120 Range / Xtrafast 96/120E1 Range | F06 | Central heating thermistor/wiring fault |
Xtrafast 96/120 Range / Xtrafast 96/120E1 Range | F08 | Storage vessel thermistor/wiring fault |
Xtrafast 96/120 Range / Xtrafast 96/120E1 Range | F09 | System pressure sensor fault |
Xtrafast 96/120 Range / Xtrafast 96/120E1 Range | F10 | Fan fault |
Xtrafast 96/120 Range / Xtrafast 96/120E1 Range | F13 | Main printed circuit board (PCB) fault |
Xtrafast 96/120 Range / Xtrafast 96/120E1 Range | F14 | Central heating flow temperature > 97 degrees |
Xtrafast 96/120 Range / Xtrafast 96/120E1 Range | F15 | Gas mechanism fault |
Xtrafast 96/120 Range / Xtrafast 96/120E1 Range | F20 | Communication fault |
Glow-worm Energy Boiler Range Error Codes |
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Fault Code | Cause of Problem | |
F.00 | Flow temperature sensor | |
F.00 | Flow temperature sensor | |
F.10 | Flow temperature sensor short circuit | |
F.11 | Flow temperature sensor short circuit | |
F.12 and F.91 | Cylinder temperature sensor short circuit | |
F.13 | Domestic hot water cylinder temperature sensor short circuit | |
F.20 | Safety switch-off – overheating temperature reached | |
F.22 | Safety switch-off – low water pressure in the boiler | |
F.23 | Safety switch-off – temperature difference too great (NTC1/NTC2) | |
F.24 | Safety switch-off – temperature rise too fast | |
F.25 | Safety switch-off – flue gas temperature too high | |
F.27 | Safety switch-off – fault in flame detection | |
F.28 | Ignition unsuccessful when starting up | |
F.29 | Flame loss | |
F.32 | Fan frost protection function active – fan speed outside the tolerance values | |
F.33 | Fan frost protection function active – air pressure switch fault | |
FA9 | eBUS fault – voltage too low | |
F.61 | Gas valve control system fault | |
F.82 | Gas valve switch-off control fault | |
F.83 | EEPROM fault – electronics defective | |
F.64 | Electronics/sensor/analogue-to-digital converter fault | |
F.85 | Electronics temperature too high | |
F.67 | Value sent back by ASIC is incorrect (flame signal) | |
F.88 | Unstable flame (analogue input), underfloor heating contact or gas valve fault | |
F.70 | Invalid product code (DSN) | |
F.71 | Flow/return temperature sensor | |
F.72 | Deviation in the water pressure sensor/return temperature sensor | |
F.73 | Water pressure sensor not connected or has short-circuited | |
F.74 | Electrical problem in the water pressure sensor | |
F.75 | Pressure sensor fault | |
F.78 | The safety cut-out in the primary heat exchanger is defective | |
F.77 | Fault: Condensate or smoke | |
F.78 | Interruption to domestic hot water (DHW) outlet sensor at external controller | |
F.83 | Burner temperature sensor fault | |
F.84 | Flow/return temperature sensor fault | |
F.85 | Temperature sensor fault | |
F.87 | Electrodes fault | |
F.89 | Pump fault | |
Connection | No communication between the printed circuit board (PCB) and the user interface | |
Glow-worm Error Codes F1, F4, F28 or F29 | ||
If you are seeing the error codes F1, F4 F28 or F29 on your boiler there’s an issue with your condensate pipe. This error appears when your pipe is frozen, which can happen during the cold months as it runs outdoors. You can fix this issue yourself if you feel confident enough, otherwise call an engineer, by thawing out the pipe which you can find out how to do with our handy guide to thawing a condensate pipe. |
Vaillant Turbomax Plus 824/828E | ||
Fault Code | Possible Cause | Meaning |
F.00 | NTC FAULTS | This means that your Flow NTC (Negative Temperature Coefficient Thermostat) cable is either defective or broken and needs to be replaced |
F.01 | NTC FAULTS (feed temperature sensor) – faulty connection and open circuit. |
This means that your Flow NTC (Negative Temperature Coefficient Thermostat) cable is either defective or broken and needs to be replaced |
F.10 | NTC FAULTS (feed temperature sensor) – short circuit | — |
F.11 | ||
F.13 | NTC FAULTS (feed temperature sensor) – short circuit | — |
F.20 | NTC FAULTS (feed temperature sensor) | Your boiler has exceeded the maximum temperature and needs to be allowed to cool down |
F.22 | DRY FIRE, LOW WATER IN SYSTEM/OVERHEAT | This means that there’s either no water in your system, you have a defective pump or the pump lead is defective |
F.24 | LOW WATER, OR PUMP FAILURE/BLOCKAGE | Your pump could be obstructed, running at low capacity, or there could be air trapped in your appliance. Additionally, the pressure in your system might be too low. |
F.28 | NO IGNITION/IGNITION PROBLEM | This means there’s either insufficient gas in the system, a defective electrode, ignition lead or electronic ignitor |
F.29 | FLAME EXTINGUISHED. FAN/FLUE PROBLEM/GAS | Your flame, or pilot light has gone out. Check your flue duct or gas supply to see if there is a problem there. |
F.60 | GAS VALVE CONTROL – DEFECTIVE | Your cable loom which connects to your gas valve might have short circuited. Alternatively, you could have a defective gas valve assembly or electronic control system. |
F.61 | GAS VALVE CONTROL – DEFECTIVE | Your cable loom which connects to your gas valve may have short circuited. Alternatively, you could have a defective gas valve assembly or electronic control system. |
F.62 | DEFECTIVE GAS VALVE CLOSURE MECHANISM | Your boiler has exceeded the maximum temperature and needs to be allowed to cool down |
F.63 | EEPROM (Electrically Erasable Programmable Read-Only Memory) ERROR | This is an electronic fault within your system. |
F.64 | ELECTRONIC SYSTEM/SENSOR FAULT | Your flow or back flow NTC has suffered a short circuit, or an electronic fault |
F.65 | ELECTRONIC SYSTEM TEMPERATURE TOO HIGH | This can happen because of an external heat source or an electrical fault |
F.67 | ELECTRONIC FAULT IN FLAME SYSTEM | — |
Vaillant EcoMax Pro 18/28E |
||
Fault Code | Possible Cause | |
F.1 | Lack of gas, a fault with the ignition or flue or you may need to adjust the gas valve or replace a defective electrode lead. |
|
F.4 | Ignition fault. | |
F.5 | The system has suffered a fault due to overheating. | |
F.6 | Your flow NTC has developed a fault. | |
F.17 | Check the polarity of your system. | |
F.24 | Pump-related faults – the pump could have failed, it may have over run or there could be an issue with the airlock |
|
Vaillant Ecomax Pro 828E | ||
Fault Code | Possible Cause | |
F.00, .04, .05, .10, .14, .15 | All of these are NTC faults, and are best resolved by first changing all NTC to make diagnosis earlier. |
|
F.21 | The pilot flame has failed. | |
F.22 | There is insufficient water in your system. | |
F.11 | A blockage in the appliance is preventing the system from flowing as it should. |
|
F.12 | A blockage in the appliance is affecting the system’s pressure. | |
F.13 | The appliance is blocked because of a water deficiency. | |
Vaillant EcoTEC 65kW Error Codes |
||
Fault Code | Possible Cause | |
S.O | Heating issue, no heat demand | |
S.1 | Fan start-up error | |
S.2 | Pump flow error | |
S.3 | Heating mode error – ignition problem | |
S.4 | Heat mode – burner on error | |
S.6 | Heating mode – fan overrun error | |
S.7 | Heating mode – pump overrun error | |
S.8 | Heating remaining cut off for XX amount of time | |
S.31 | No heat demand summer operating mode | |
S.34 | Heating mode frost protection error | |
S.20 | Hot water requirement error | |
S.22 | Hot water handling pump flow error | |
S.24 | Hot water operation burner is on | |
S.85 | Service message quantity of circulation water | |
Vaillant EcoTEC Pro / EcoTEC Plus Error Codes |
||
Fault Code | Possible Cause | |
F.00 / F.0 | Flow temperature sensor interruption | |
F.01 / F.1 | Return temperature sensor interruption | |
F.10 | Flow NTC short circuit | |
F.11 | Return NTC short circuit | |
F.20 | Safety switch off temperature limiter | |
F.22 | Safety switch off low water pressure | |
F.23 | Safety switch off temperature difference too great | |
F.24 | Safety switch off temperature is rising to fast | |
F.25 | Safety switch off flue gas temperature too high | |
F.26 | Error with gas valve – possible no function | |
F.27 | Safety switch off flame simulation | |
F.28 | Failure during start up – ignition unsuccessful to start | |
F.29 | Failure during operation – re-ignition unsuccessful | |
F.32 | Fan error | |
F.49 | eBUS error – possible short circuit | |
F.61 | Error with gas valve regulation | |
F.62 | Error with gas valve – switch off delay | |
F.63 | EEPROM error | |
F.64 | Electronics / NTC error | |
F.65 | Electronic temperature error could be overheating due to external influences |
|
F.67 | Electronics flame signal error | |
F.68 | Unstable flame signal error air in gas | |
F.70 | Invalid device specific number (DSN) | |
F.71 | Flow NTC error – flow temperature sensor signal constant value | |
F.72 | Flow return NTC error – temperature difference too great | |
F.73 | Water pressure sensor signal in the wrong range, it is too low | |
F.74 | Water pressure sensor signal outside correct range, the sensor signal is too high |
|
F.75 | Error with pressure – no pressure change detection when starting the pump |
|
F.76 | Overheating protection on – primary heat exchanger has responded | |
F.77 | Flue non return flap condensate pump error | |
F.78 | Interruption to DHW outlet sensor at external controller | |
F.83 | Flow and or return temperature sensor error | |
F.84 | Error with flow/return temperature sensor temperature changing error | |
F.85 | Error with flow and return temperature, sensor incorrectly fitted | |
CONNECTION | No communication with the PCB | |
Vaillant EcoTEC Pro / EcoTEC Plus Error Codes |
||
Fault Code | Possible Cause | |
S.00 | Heating mode error – no heat demand | |
S.01 | Heating mode fan start-up | |
S.02 | Heating mode error – water pump running | |
S.03 | Heating mode – ignition sequence error | |
S.04 | Heating mode – burner ignited | |
S.06 | Heating mode – fan overrun error | |
S.07 | Heating mode – pump overrun error | |
S.08 | Heating remaining cut off time xx minutes | |
S.10 | Hot water demand via impeller sensor | |
S.11 | DHW mode fan start up error | |
S13 | DHW mode ignition error | |
S.14 | Hot water demand via fan sensor error | |
S.15 | DHW mode pump and fan overrun | |
S.16 | DHW mode – fan overrun error | |
S.17 | DHW mode – pump overrun error | |
S.20 | DHW mode – burner on error | |
S.21 | DHW mode – fan start up error | |
S.22 | DHW demand – error pump running | |
S.23 | DHW ignition error | |
S.24 | DHW mode – burner error | |
S.25 | DHW mode – pump or fan overrun error | |
S.26 | DHW mode – fan overrun | |
S.27 | DHW mode – pump overrun | |
S.28 | Hot water burner anti-cycling time | |
S.30 | Room thermostat is blocking heating mode | |
S.31 | No heat demand boiler in summer operating mode | |
S.32 | Waiting period because of fan speed deviation | |
S.34 | Heating mode frost protection error | |
S.39 | Burner off contact has been triggered this could be because of contact thermostat or condensate pump |
|
S.40 | Comfort safety mode active | |
S.41 | Water pressure > 2.8 bar | |
S.42 | Flue non return flap return signal blocks burner operation | |
S.46 | Comfort safety mode flame loss at minimum load | |
S.53 | Boiler is in waiting period of modulation f block function due to water shortage |
|
S.54 | Boiler is in waiting period of operation, blocking function as a result | |
S.57 | Waiting period comfort safety mode | |
S.58 | Modulation limitation due to noise / wind error | |
S.61 | Gas family check unsuccessful | |
Vaillant EcoTEC Plus Regular Gas Boiler Error Codes |
||
Fault Code | Possible Cause | |
S.20 | Warnstar demand | |
S.21 | Fan running | |
S.22 | Pump running | |
S.23 | Ignition sequence | |
S.24 | Burner ignited | |
S.25 | Fan and water pump running | |
S.26 | Fan overrun | |
S.27 | Pump overrun | |
S.28 | Anti-cycling mode | |
S.30 | No heating demand from external controls | |
S.31 | Central heating thermostat knob turned off | |
S.32 | Heat exchanger antifreeze active as fan speed variation is too high | |
S.34 | Anti-frost mode is active | |
S.36 | Not heating demand form low voltage | |
S.41 | Water pressure greater than 2.9 bar | |
S.42 | Response from accessory module or defective condensate pump is blocking burner operation |
|
S.53 | Appliance is within the waiting period of the block operation function due to water shortage |
|
S.54 | Appliance is within the waiting period of the block operation due to water shortage |
|
S.96 | Return sensor error | |
S.98 | Flow return sensor check is running demand is block | |
D.0 | Heating part load error | |
D.1 | Water pump overrun – time for heat mode | |
D.2 | Max burner anti-cycling period at 20c flow temperature | |
D.3 | Hot water flow temperature reading | |
D.4 | Current temperature for warm stat sensor | |
D.7 | Warm start temperature target value | |
D.8 | External controls heat demand | |
D.9 | Flow target temperature from external analogue regulator terminal | |
D.10 | Status internal heating pump error | |
D,11 | Status external heating pump error | |
D.12 | Cylinder charging pump via accessory module | |
D.13 | Hot water circulation pump | |
D.22 | Hot water demand | |
D.23 | Summer/Winter function | |
D.25 | Hot water activation via ebus control | |
D.30 | Control signal for both gas valves | |
D.33 | Fan speed target value | |
D.34 | Fan speed actual value | |
D.36 | Hot water flow sensor | |
D.40 | Flow temperature target value | |
D.41 | Return temperature actual value | |
D.44 | Digitised ionisation potential error | |
D.47 | Outside temperature with weather compensator – Vaillant controller only | |
D.76 | Remaining burner anti-cycling time in min | |
D.90 | Digital regulator status | |
D.91 | DCF status with connected external probe | |
D.97 | Activation of the second diagnostic level | |
D.17 | Heating glow return regulation | |
D.18 | Pump mode return | |
D.19 | Operating modes of the two speed heating pump | |
D.20 | Maximum set value for target cylinder | |
D.27 | Switching accessory relay 1 | |
D.28 | Switching accessory relay 2 | |
D.50 | Offset for minimum speed | |
D.51 | Offset for maximum speed | |
D.58 | Activation of solar reheating | |
D.60 | Number of safety temperature cut off | |
D.61 | Number of unsuccessful lockouts | |
D.64 | Average ignition times | |
D.65 | Maximum ignition time | |
D.68 | Unsuccessful ignitions in the first attempt | |
D.69 | Unsuccessful ignition for the second time | |
D.70 | Set diverter valve position | |
D.71 | Maximum setting of heater control knob | |
D.72 | Pump overrun time after warm start | |
D.73 | Off set for warm start target value | |
D.75 | Maximum charging time for a storage without own controller | |
D.77 | Limitation of cylinder charging in output in kW | |
D.78 | Limitation of cylinder charging temperature in c | |
D.80 | Operating hours heating | |
D.81 | Operating hours hot water generation | |
D.82 | Burner start up in heating mode | |
D.83 | Burner start up in hot water mode | |
D.84 | Maintenance indicator – number of hours until the next maintenance | |
D.93 | DSN appliance variant setting | |
D.96 | Factory setting | |
Vaillant EcoTEC Plus Gas Boiler Error Codes |
||
Fault Code | Possible Cause | |
P.00 | The heating circuit and hot water circuit are purged | |
P.01 | Maximum load test program error | |
P.02 | Minimum load test program | |
P.06 | Filling mode test program | |
Vaillant EcoTEC Gas Boiler Error Codes | ||
Fault Code | Possible Cause | |
D.0 | Heating part load error | |
D.1 | Water pump overrun – time for heat mode | |
D.2 | Max burner anti-cycling period at 20c flow temperature | |
D.3 | Hot water flow temperature reading | |
D.4 | Current temperature for warm stat sensor | |
D.5 | Set value of flow temperature or target value of return | |
D.7 | Warm start temperature target value | |
D.8 | External controls heat demand | |
D.9 | Flow target temperature from external analogue regulator terminal | |
D.10 | Status internal heating pump error | |
D,11 | Status external heating pump error | |
D.12 | Cylinder charging pump via accessory module | |
D.13 | Hot water circulation pump | |
D.15 | Pump speed actual value | |
D.22 | Hot water demand | |
D.23 | Summer/Winter function | |
D.24 | Not relevant | |
D.25 | Hot water activation via eBus control | |
D.30 | Control signal for both gas valves | |
D.33 | Fan speed target value | |
D.34 | Fan speed actual value | |
D.35 | Not relevant | |
D.40 | Flow temperature target value | |
D.41 | Return temperature actual value | |
D.44 | Digitised ionisation – potential error | |
D.47 | Outside temperature with weather compensator – Vaillant controller only | |
D.76 | Remaining burner anti-cycling time in min | |
D.90 | Digital regulator status | |
D.91 | DCF status with connected external probe | |
D.97 | Activation of the second diagnostic level | |
D.98 | Telephone a heating engineer | |
D.14 | Pump speed target value | |
D.17 | Heating flow return regulation | |
D.18 | Pump operating mode | |
D.20 | Maximum set value for target cylinder | |
D.26 | Additional relay control ecoTec | |
D.27 | Switching accessory relay 1 | |
D.28 | Switching accessory relay 2 | |
D.50 | Offset for minimum speed | |
D.51 | Offset for maximum speed | |
D.60 | Number of safety temperature cut offs | |
D.61 | Number of unsuccessful lockouts | |
D.64 | Average ignition times | |
D.65 | Maximum ignition time | |
D.67 | Remaining burner anti-cycling time | |
D.68 | Unsuccessful ignitions in the first attempt | |
D.69 | Unsuccessful ignition for the second time | |
D.70 | Set diverter valve position | |
D.71 | Maximum setting of heater control knob | |
D.72 | Pump overrun time after warm start | |
D.75 | Maximum charging time for a storage without own controller | |
D.77 | Limitation of cylinder charging in output in kW | |
D.78 | Limitation of cylinder charging temperature in celsius | |
D.80 | Operating hours heating | |
D.81 | Operating hours hot water generation | |
D.82 | Burner start up in heating mode | |
D.83 | Burner start up in hot water mode | |
D.84 | Maintenance indicator – number of hours until the next maintenance | |
D.93 | DSN appliance variant setting | |
D.96 | Factory setting | |
Vaillant Error Codes F28 and F29 | ||
If your Vaillant boiler is showing either error code F28 or F29 then the condensate pipe has frozen and needs to be thawed. This issue can occur during the colder months as the pipe runs outside but can be resolved fairly easily without the need for an engineer as the pipe just needs to be thawed out. Find out everything you need to know by checking our handy guide to thawing a frozen condensate pipe. |
Zanussi Boiler Error Codes |
|
Fault Code | System Behaviour |
C0 | Boiler chip card (BCC) activation fault |
C2 | Boiler chip card (BCC) fault |
F1 | Low water pressure |
F2 | Flame loss |
F3 | Fan fault |
F4 | Flow thermistor |
F5 | Return thermistor |
F6 | Outside sensor failure |
F7 | Low mains voltage |
F9 | Un-configured printed circuit board (PCB) |
L1 | Flow temperature overheat or no water flow |
L2 | Flame loss |
L5 | 5 boiler resets in 15 minutes |
L6 | False flame lockout |
Ideal Boiler Error Codes |
|
Fault Code | System Behaviour |
C0 | Boiler chip card (BCC) activation fault |
C2 | Boiler chip card (BCC) fault |
F1 | Low water pressure |
F2 | Flame loss |
F3 | Fan fault |
F4 | Flow thermistor fault |
F5 | Return thermistor fault |
F6 | Outside sensor failure |
F7 | Low mains voltage |
F9 | Un-configured printed circuit board (PCB) |
L1 | Flow temperature overheat or no water flow |
L2 | Flame loss |
L5 | 5 boiler resets in 15 minutes |
L6 | False flame lockout |
Fault Code | System Behaviour |
0 | The boiler is in standby mode awaiting either a central heating call or hot water demand |
C | The boiler has a call for central heating but the appliance has reached the desired temperature set on the boiler |
D | The boiler has a call for hot water but the appliance has reached the desired temperature set on the boiler |
C | The boiler is operating in central heating mode |
d | The boiler is operating in hot water mode |
F | The boiler is operating in frost mode |
Ideal Logic Max System / Logic Plus System Boiler Error Codes |
|
Fault Description | System Behaviour |
L1 | Flow temperature overheat lockout or no water flow lockout |
L2 | Ignition lockout |
LC | Turn power off and on |
L6 | False flame lockout |
F1 | Low water pressure |
F2, FN or LN | Flame loss |
F3 | Fan fault |
L4 or F4 | Control / no flow thermistor fault |
L5 or F5 | Return thermistor fault |
F6 | Outside sensor fault |
F7 | Low mains voltage. Contact electricity provider. |
F9, L9, F8 or L8 | Printed circuit board (PCB) un-configured or fault |
FU | Diff greater than 50c check isolation valves are open |
No central heating | |
No hot water | |
No display | |
Ideal Logic Max / Logic Plus Regular Boiler Error Codes |
|
Fault Description | System Behaviour |
L1 | Flow temperature overheat lockout or no water flow lockout |
L2 | Ignition lockout |
LC | 5 restarts within 15 minutes |
L6 | False flame lockout |
FA | Flow return reversed |
FD | No water flow |
F2 or FN or LN | Flame loss |
F3 | Fan fault |
L4 or F4 | Control / no flow thermistor fault |
L5 or F5 | Return thermistor fault |
F6 | Outside sensor fault |
F7 | Low mains voltage Contact electricity provider |
F9, L9, F8 or L8 | Printed circuit board (PCB) un-configured or fault |
FU | Diff greater than 50c check isolation valves are open |
| |
Ideal Logic Max Plus Combi Boiler Error Codes | |
Fault Description | System Behaviour |
Overheat lockout | Bleed radiators, refill system to 1.0 bar, check that radiator and boiler valves are open and reset boiler. If fault continues book an engineer. |
Ignition lockout | Check gas appliances work and restart boiler. |
Too many restarts | 5 starts within 15 minutes. Turn power on and off. |
Flame on before gas on | False flame lockout. |
Water pressure | With boiler off and system cold fill system to 1.0 bar and bleed radiators if fault continues contact an installer. |
Ideal Vogue Boiler Error Codes |
|
Fault Description | System Behaviour |
Too many resets | 5 restarts within 15 minutes |
Flame on before gas valve on | Flame on before gas valve is on |
Flow thermistor fault | Flow thermistor error |
Low mains voltage | Less than 185v to boiler then check voltage at boiler mains in if mains voltage is okay pump needs replacing |
Low water pressure | Low water pressure |
Flow return reversed | Check if the flow thermistor is correctly clipped to pipe. If not, replace flow thermistor. |
Printed circuit board (PCB) recently replaced |
Reset boiler |
Pump rotor blocked | Unblock pump |
Flow temperature set point cannot be increased to 80c |
Check flow and return thermistors securely clamped to pipes check flow and return thermistor |
| |
Ideal Boiler Error Descriptions |
|
Fault Description | Cause |
Thermal fuse lockout | Reset the boiler |
Too many boiler resets | 5 resets within 15 minutes. Turn power off and on. |
Printed circuit board (PCB) replaced incorrectly | Ensure the boiler chip card (BCC) is fitted correctly. |
Low mains voltage | Less than 160V to boiler. Contact electricity provider. |
Low water pressure | Increase system pressure to 1.5 bar |
Flow/Return reversed | Check if flow thermistor is correctly clipped to pipe. Replace flow thermistor. |
Printed circuit board (PCB) replaced | Reset the boiler |
No connection to primary printed circuit board (PCB) | Unblock pump |
Pump rotor blocked | No connection to primary printed circuit board (PCB) |
Flow temperature set point cannot be increased to 80ºC | Ensure flow temperature is not limited within installer mode |
Pump runs during the night | Ensure system frost protection temperature set point isn’t set too high |
Has the printed circuit board (PCB) just been replaced? | Reset the boiler |
Are the boiler, central heating and hot water systems filled with water? Are all isolation valves and radiator valves open? | Fill and vent the system and open all isolation valves, then reset the boiler |
Is the Flow/Return differential across the boiler in excess of 30c | Check the flow and return thermistors |
Check that the pump is rotating freely. | Replace the pump, then reset the boiler |
If the boiler is reset, does it ignite for a short time and then extinguish? | Check the detection electrode and associated harness for continuity, visual condition and position. Check if the condensate pipe is blocked. |
Is the gas pressure available at the boiler > 18mBar | Check gas supply and rectify fault |
Is 215Vdc available at the gas valve during ignition? | Check wiring from gas valve to printed circuit board (PCB) and replace if necessary, otherwise replace the main PCB |
Unplug the gas valve – is the resistance between the pins between 1kW and 10kW? | Replace gas valve |
Baxi Platinum Error Codes |
|
Fault Code | Possible Cause |
E20 | Central heating NTC error |
E28 | Error with the NTC flue. Possible air pressure switch error. Blocked flue or condensate or wing fault |
E50 | Hot water NTC error |
E110 | Thermostat operated safety |
E119 | Water pressure switch error – Not operated. |
E125 | Primary circuit error circulation fault |
E130 | FLue NTC Operation error |
E133 | Gas supply Error or flame failure |
E160 | Fan Error / Fan Wiring Error |
E193 | Pre-circulation error |
Baxi EcoBlue Error Codes | |
Fault Code | Possible Cause |
110 | Overheated – try bleeding your radiators |
117 | Water pressure too high |
118 | Water pressure too low |
125 | Water circulation fault |
133 | Safety time to establish flame exceeded |
E10 | Outdoor sensor error |
E20 | Central heating thermistor sensor fault |
E28 | Flue thermistor fault |
E54 | Domestic hot water (DHW) flow sensor fault |
E78 | Water pressure sensor fault |
E100 | Internal clock time error on printed circuit board (PCB) |
E109 | Poor circulation |
110 | Overheat – try bleeding your radiators |
111 | Maximum limit of flow temperature |
117 | Water pressure too high |
118 | Water pressure too low |
119 | System pressure too low |
125 | Water circulation fault |
127 | Legionella (cause of Legionnaires’ disease) protection temperature not reached |
128 | Loss of flame during operation |
133 | Safety time to establish flame exceeded |
153 | Forced reset unit unlocked |
160 | Fan fault |
162 | Air pressure switch error |
164 | Pressure Sensor Error (UK) – Heating flow switch error (Ireland) |
166 | Air pressure switch fault |
270 | Dry fire |
432 | Earth connector error |
433 | Heat exchanger temperature exceeded (greater than 95 degrees) |
EcoBlue Advance / Ecoblue Regular Gas Boiler Flashing Light Error Codes |
|
Fault Code | Possible Cause |
1 green flash | Boiler temperature reached. No action required. |
3 green flashes | Temporary flame loss. Boiler will self reset, if fault continues you will see 3 red flashes. |
4 green flashes | Communication error between printed circuit board (PCB) and control. Temporary error, will self reset. |
5 green flashes | Parameter error on printed circuit board (PCB). Temporary error, will self reset |
6 green flashes | Miscellaneous error. Temporary error, will self reset. |
1 red flash | Sensor error, temperature fault or flow fault. |
2 red flashes | Boiler overheat tripped |
3 red flashes | Ignition fault. Boiler has attempted to light 5 times and failed. |
4 red flashes | Fan fault |
5 red flashes | Parameter storage unit (PSU) error. |
6 red flashes | Miscellaneous error. |
Baxi Duo-tec/Megaflo Error Codes |
|
Fault Code | Possible Cause |
E10 | Outdoor sensor fault |
E20 | Central heating thermistor sensor error |
E28 | Flue thermistor error |
E110 | Boiler overheat error |
E119 | Low water pressure error |
E125 | Primary water circulation error |
E131 | Flue overheat lockout error |
E133 | Ignition error |
E160 / E161 | Fan error |
E164 | Pressure sensor fault |
E167 | Printed circuit board (PCB) error |
E168 | Printed circuit board (PCB) lockout error |
E193 | Circulation error |
Baxi 200 / 400 Combi Gas Boiler Error Codes |
|
Fault Code | Possible Cause |
H.01 – .00 | Loss of communication between gas valve and boiler board. Possible fault in air/gas unit or loose connection to gas valve. |
H.01 – .05 | Difference between the flow and return temperature is too high, sensor error or insufficient circulation. |
H.01 – .08 | Sensor fault, flow temperature increasing too fast in heating mode or insufficient circulation. |
H.01 – .14 | Maximum flow temperature value exceeded or insufficient circulation – temporary fault. |
H.01 – .18 | No water circulation, insufficient circulation or sensor error. |
H.01 – .21 | Temporary error – flow temperature increasing too fast in domestic hot water (DHW) mode, insufficient circulation or sensor error. |
H.02 – .02 | Temporary error – no input of parameters C1/C2. Printed circuit board (PCB) not configured. |
H.02 – .03 | Temporary error- incorrect configuration settings C1/C2. |
H.02 – .04 | Temporary error- parameter fault. Incorrect parameters. |
H.02 – .06 | Temporary error caused by system water pressure, water leak on boiler, water leak on system. |
H.03 -.00 | Temporary error with communication, negative temperature coefficient thermostat (NTC) or flue sensor. Sensor could also be unconnected or have a bad connection. |
H.03 – .01 | Communication error with the printed circuit board (PCB) |
H.03 – .02 | Flame error – no flame during operation. |
E.00 – .04 | Return temperature sensor open-circuit. Sensor not or badly connected. |
E.00 – .05 | Return temperature sensor short-circuit. Sensor not connected or badly connected. |
E.01 – .02 | Temperature measured by return sensor greater than flow sensor. |
E.01 – .04 | Loss of flame detected 5 times in 24 hours (with burner on). |
E.01 – .11 | Incorrect fan speed – external draught over the boiler or defective gas/air unit. |
E.01 – .12 | Requires reset – temperature measured by return sensor greater than flow temperature. |
E.01 – .17 | Reset the boiler – no circulation, sensor fault either not connected or has a bad connection. |
E.01 – .20 | Maximum flue gas temperature reached. No circulation or sensor fault. |
E.02 – .00 | Reset button has been pressed. |
E.02 – .07 | No or low system water pressure. system pressure less than 0.5bar |
E.02 – .16 | Permanent fault caused by channel service unit (CSU) time-out or printed circuit board (PCB) damage. |
E.02 – .17 | Loss of communication between gas valve and boiler printed circuit board (PCB) or fault in air/gas unit. |
E.02 – .19 | Jumper 1 changed – check position of jumper 1. |
E.02 – .20 | Jumper 2 changed – check position of jumper 2. |
E.02 – .21 | Jumper 3 changed – check position of jumper 3. |
E.02 – .47 | Wiring to external device error. |
E.02 – .48 | Configuration to external device unsuccessful – check pairing to external device. |
E.04 – .00 | Gas valve error – gas valve not detected. |
E.04 – .01 | Flow temperature sensor short-circuited. Sensor not or badly connected, bad connection or sensor fault. |
E.04 – .02 | Permanent fault. Flow temperature sensor open-circuited, sensor not or badly connected, bad connection or sensor fault. |
E.04 – .03 | Permanent fault. Critical flow temperature reached, non-existent or insufficient circulation. |
E.04 – .04 | Permanent fault. Flue temperature sensor short-circuited, sensor not or badly connected, bad connection or sensor fault. |
E.04 – .05 | Permanent fault. Flue temperature sensor short-circuited, sensor not or badly connected, bad connection or sensor fault. |
E.04 – .06 | Permanent fault. Critical flue gas temperature value reached, no circulation or sensor fault. |
E.04 – .08 | Permanent fault. Maximum safe temperature value reached, safety thermostat open-circuited, no circulation, sensor not or badly connected, bad connection or sensor fault. |
E.04 – .10 | Failure to light (could be gas supply issue). |
E.04 – .12 | Permanent fault. False flame signal, short-term fluctuation of the mains, ionisation current present even though there is no flame, the burner remains very hot (CO2 too high) or defective gas/air unit. |
E.04 – .13 | Permanent fault. Fan rotor blocked, fan seized or wiring to fan damaged. |
E.04 – .17 | Permanent fault. Problem with gas valve or defective gas/air unit. |
Baxi 600 Combi Gas Boiler Error Codes | |
Fault Code | Possible Cause |
E09 | Gas valve connection cable. |
E10 | External probe fault. |
E12 | Differential water flow switch fault (still open). |
E13 | Differential water flow switch fault (still closed). |
E15 | Gas valve command fault. |
E20 | Central heating negative temperature coefficient (NTC) thermostat fault. |
E28 | Flue negative temperature coefficient (NTC) thermostat fault. |
E40 | Central heating return negative temperature coefficient (NTC) thermostat fault. |
E50 | Domestic hot water (DHW) negative temperature coefficient (NTC) thermostat sensor fault (tank boiler) (s.c.) or DHW NTC sensor fault (tank boiler) (o.c.). |
E83/E84/E85/E86/E87 | No communication. |
E109 | Pre-circulation fault. |
E110 | Boiler max temperature exceeded for gradient (probable pump jammed or air in the circuit Boiler max temperature exceeded for over temperature (probable pump jammed or air in the circuit Safety thermostat sensor tripped. |
E118 | Primary system water pressure too low (< 0.5 bar). |
E125 | Circulation fault (primary). |
E128 | Frequent flame failure (12 times). |
E129 | Safety error for frequently loss of flame with max correction during the ignition during Calibration Function. |
E130 | Flue thermostat sensor tripped (lockout). |
E133 | Failure to light (could be a gas supply issue). |
E134 | Elapsed time gas valve open without gas (short request in a short period) |
E135 | Interruption of gas supply (internal error). |
E154 | Flow/return sensor temperature test. |
E160 | Fan or fan wiring fault. |
E163 | Domestic hot water (DHW) negative temperature coefficient (NTC) thermostat sensor fault (s.c.) or DHW NTC sensor fault (o.c.). |
E270 | Circulation fault (dry fire). |
E317 | Wrong power supply electrical frequency (Hz). |
E321 | Hot water negative temperature coefficient (NTC) fault. |
E384 | False flame. |
E385 | Under voltage. |
E430 | Water pressure temporary test. |
E430 + Flame ‘crossed’ | Water pressure test failed. |
Baxi MainEco Error Codes |
|
Fault Code | Possible Cause |
1 Green Flash | Boiler temperature reached – no action required |
3 Green Flashes | Temporary flame loss – this is a temporary error, the system should reset on its own |
4 Green Flashes | Communication error between printed circuit board (PCB) and Control – this is a temporary error, the system should reset on its own |
5 Green Flashes | Parameter error on parameter storage unit (PSU) or printed circuit board (PCB) – this is a temporary error, the system should reset on its own. |
6 Green Flashes | Miscellaneous error |
1 Red Flash | Sensor error, sensor fault, temperature fault or flow fault – this is a temporary error, the system should reset on it’s own. |
2 Red Flashes | Boiler overheat tripped |
3 Red Flashes | Ignition fault. Boiler has attempted to light 5 times and failed |
4 Red Flashes | Fan Fault |
5 Red Flashes | Parameter storage unit (PSU) error |
6 Red Flashes | Miscellaneous |
| |
| |
Baxi Avanta Range Error Codes |
|
Fault Code | Possible Cause |
E0 | Temperature sensor fault |
E1 | Overheated – try bleeding your radiators |
E2 | Poor circulation – try bleeding your radiators |
E3 | Printed circuit board (PCB) fault |
E4 | Ignition failure – try bleeding your radiators |
E10 | Poor/No circulation |
E12 | Printed circuit board (PCB) Fault |
E13 | Heat exchanger thermal fuse tripped |
E83 / 84 / 85 / 86 / 87 | Fan fault normally E8 |
Baxi GA Range Error Codes |
|
Fault Code | Possible Cause |
E53 | Poor combustion – flue terminal may be blocked |
E110 | Overheated – try bleeding your radiators |
E117 | System water pressure high – try bleeding water from your radiators |
E118 | System water pressure low |
E125 | Overheat – try bleeding your radiators |
E133 | Gas supply fault |
E4 | Ignition failure |
E09 | Gas valve wiring fault |
E10 | Outdoor sensor error |
E15 | Gas valve connection fault |
E20 | Central heating thermistor sensor fault |
E28 | Flue thermistor fault |
E40 | Central heating return thermistor fault |
E53 | Flue obstruction |
E55 | Calibration required |
E78 | Water pressure sensor fault |
E92 | Combustion test alarm during auto-setting |
E109 | Poor circulation |
E110 | Boiler overheat tripped |
E117 | System pressure high (>2.9 Bar) |
E118 | System pressure low(< 0.5bar) |
E125 | Primary water circulation fault |
E128 | Loss of flame during operation |
E129 | Loss of flame during calibration |
E133 | Ignition fault |
E135 | Internal error |
E154 | Primary flow fault |
E160 | Fan fault |
E270 | Dry fire |
E317 | Wrong power supply (Hz) |
E321 | Not water thermistor fault |
E384 | Flame detected when gas valve off |
E385 | Low voltage (less than 195v) |
Baxi Solo Error Codes |
|
Fault Code | Possible Cause |
FLASH FLASH ON | Fan error |
FLASH OFF FLASH | Voltage less than 180V |
FLASH OFF ON | Overheat lockout |
FLASH ON FLASH | Printed circuit board (PCB) error |
FLASH ON ON | Printed circuit board (PCB) fault |
OFF OFF OFF | No power |
ON FLASH FLASH | Circulation error or dry fire |
ON FLASH ON | Thermistor error |
ON OFF FLASH | Live and neutral reversed error |
ON OFF ON | Ignition lockout error |
ON ON FLASH | Printed circuit board (PCB) error |
ON ON ON | Low voltage wiring harness error |
Error Code E133 and E28 |
|
If you’re seeing either of these two error codes on your Baxi boiler, this is due to your condensate pipe being frozen. In the cold winter months this can happen easily as the condensate pipe runs outside. You can fix this issue by thawing out the pipe (if you feel confident to), find out everything you need to know about how to do it with our guide to thawing a frozen condensate pipe. |
Ferroli iBoiler Error Codes | ||
Fault Code | System Behaviour | |
A01 | Ignition error – possible electrode fault or power too low, no gas or excessive condensate level | |
A02 | Electrode or card error | |
A03 | Heating sensor damaged, no water circulation or air in system | |
F04 | Wrong card parameter setting | |
F05 | Air pressure switch contact error – wrong flue baffle obstructed or not correctly sized | |
A06 | No flame after the ignition phase – low pressure in gas system burner minimum pressure setting | |
F07 | Air pressure switch error – contacts closed on activation of fan | |
A09 | Gas valve error – wiring could be disconnected or error with gas valve | |
F10 | Delivery sensor error, sensor damaged wiring shorted or disconnected | |
F11 | Domestic hot water (DHW) sensor error – sensor damaged, wiring shorted or disconnected | |
A15 | Fault F05 generated 5 times within the last 24 hours – possible error with the air pressure switch | |
A16 | Gas valve error – wiring disconnected or faulty gas valve | |
A23 | Card parameter error – possibly wrong card parameter setting | |
A24 | Card parameter error – possibly wrong card parameter setting | |
F34 | Supply voltage under 170V – electric mains error | |
F35 | Faulty mains frequency – electric mains error | |
F37 | Error with system water pressure, possible pressure too low or water pressure switch is damaged | |
F43 | Exchanger protection intervention – could be because no system water circulation or there’s air in the system |
|
F50 | Controller DBM23B error – controller could have an internal error | |
F51 | Controller DBM23B error – controller could have an internal error | |
Ferroli Modena HE System Error Codes |
||
Fault Code | System Behaviour | |
A01 | No burner ignition – possible electrode error, defective gas valve or incorrect inlet gas pressure | |
A02 | Flame detected with the burner off – electrode defective main board defective | |
A03 | High limit protection – possible flow temperature sensor not active or incorrectly located, no system circulation |
|
A04 | Flue gas fault – fault F07 happened 3 times in the last 24 hours | |
A05 | Fan error – tachometer signal interrupted for 1 hour or longer | |
A06 | No flame after the ignition phase – electrode error, flame unstable, incorrect valve gas offset or flue gas circuit obstructed |
|
A41 | Flow sensor error – sensor disconnected | |
A42 | Flow sensor error – sensor damaged | |
F07 | High fume temperature – the exchanger probe detects an excessive temperature | |
F10 | Flow sensor error – sensor damaged, short circuited, sensor damaged or wiring broken | |
F11 | Return sensor error – t-sensor damaged, short circuited, sensor damaged or wiring broken | |
F13 | Exchanger probe error – t-sensor damaged, short circuited, sensor damaged or wiring broken | |
F14 | Flow sensor error – t-sensor damaged, short circuited, sensor damaged or wiring broken | |
F15 | Fan problem – tachometer signal interrupted fan connection or damaged debris in fan. You need to check and clean fan debris |
|
F34 | Supply voltage under 170v – electric supply error | |
F35 | Irregular mains frequency – electric supply problem | |
F37 | Incorrect system water pressure error – possible sensor damaged or pressure too low | |
F43 | Exchanger protection activation – no system circulation air in system | |
F52 | Flow sensor – fault sensor damaged | |
A61 | Controller ABM03B error – controller has an internal error | |
A62 | No communication between controller and gas valve – controller not connected or valve damaged | |
A63 / A64 / F66 | Controller ABM03B error – controller internal error | |
Ferroli Modena HE Combi Error Codes | ||
Fault Code | System Behaviour | |
A01 | No burner ignition – possibly no gas, detection or ignition electrode fault, defective gas valve, incorrect inlet gas pressure |
|
A02 | Flame detected with the burner off – possibly caused by ionisation, defective electrode or main board defective. Check the printed circuit board (PCB) or ionizing electrode wiring |
|
A03 | High limit protection – flow temperature sensor not active, incorrectly located or no system circulation. Check the position of the flow sensor or check pump and radiator valves |
|
A04 | Flue gas fault – could be because F07 happened 3 times in the last 24 hours – check the flue | |
A05 | Fan problem – tachometer signal interrupted for 1 hour or longer – check the wiring and the fan | |
A06 | No flame after ignition phase – possible causes: detection electrode fault, flame unstable, incorrect valve gas offset, flue gas circuit |
|
A41 | Flow sensor disconnected – check the correct positioning and operation of the flow sensors | |
A42 | Flow sensor fault – sensor needs changing | |
F07 | High fume temperature – the exchanger probe detects an excessive temperature for over 2 minutes – check the exchanger. |
|
F10 | Flow sensor fault – possible causes: sensor damaged, short circuited or wiring broken check the wiring |
|
F11 | Return sensor fault – sensor wiring shorted or broken – check the wiring | |
F12 | Domestic hot water (DHW) sensor fault – sensor damaged, wiring shorted or wiring disconnected – check the wiring |
|
F13 | Exchange probe fault – wiring shorted or wiring broken – check wiring | |
F14 | Fan problem – tachometer signal interrupted fan connection. Fan damaged or debris in fan – check the wiring, the fan and clean debris |
|
F15 | Supply voltage under 170v – electric supply problem – the electrical system needs checking | |
F34 | Irregular mains frequency – possible electric supply problem – the electrical system needs checking |
|
F35 | Incorrect system water pressure – possible cause is pressure too low or sensor damaged – the system may need filling or check the sensor |
|
F37 | External probe fault sensor damaged or short circuited – check the wiring | |
F39 | Exchanger protection activation – possibly caused by no system circulation, air in the system or sensor damaged |
|
F43 | Flow sensor fault – sensor damaged – sensor needs changing | |
F52 | Controller 041049G0 fault – controller internal error | |
A61 | No communication between controller and gas valve controller – could not be connected or valve damaged |
|
A62 | Controller 041049G – internal error | |
A63 / A64 / F66 | Controller DBM12 fault | |
Ferroli Discontinued Boiler Error Codes |
||
DOMIcondens HE 26 C | ||
OPTIMAX HE PLUS 31C boiler | ||
OPTIMAX HE PLUS 38C boiler | ||
Boilers | Fault Code | System Behaviour |
DOMIcondens HE 26 C / OPTIMAX HE PLUS 31C | A01 | No burner ignition |
OPTIMAX HE PLUS 38C | A01 | The burner fails to light |
DOMIcondens HE 26 C / OPTIMAX HE PLUS 31C boiler / OPTIMAX HE PLUS 38C |
A02 | Flame present signal with burner off, possible electrical fault |
DOMIcondens HE 26 C / OPTIMAX HE PLUS 31C boiler / OPTIMAX HE PLUS 38C |
A03 | Over temperature protection activation |
DOMIcondens HE 26 C / OPTIMAX HE PLUS 31C | A04 | Fume thermostat fault |
OPTIMAX HE PLUS 38C | A04 | Fume extraction duct safety device activation |
DOMIcondens HE 26 C / OPTIMAX HE PLUS 31C | A05 | Fan fault or fume pressure switch fault |
OPTIMAX HE PLUS 38C | A05 | Fan protection activated |
DOMIcondens HE 26 C / OPTIMAX HE PLUS 31C boiler / OPTIMAX HE PLUS 38C |
A06 | No flame after the ignition phase |
OPTIMAX HE PLUS 31C boiler / OPTIMAX HE PLUS 38C |
F07 | High fume temperature |
DOMIcondens HE 26 C | F07 | Card parameter |
DOMIcondens HE 26 C | A09 | Gas value fault |
DOMIcondens HE 26 C / OPTIMAX HE PLUS 31C boiler / OPTIMAX HE PLUS 38C |
F10 | Delivery sensor 1 fault |
DOMIcondens HE 26 C | F11 | DHW sensor fault |
OPTIMAX HE PLUS 31C boiler / OPTIMAX HE PLUS 38C |
F11 | Return sensor fault |
OPTIMAX HE PLUS 31C boiler / OPTIMAX HE PLUS 38C |
F13 | Fume sensor fault |
DOMIcondens HE 26 C / OPTIMAX HE PLUS 31C boiler / OPTIMAX HE PLUS 38C |
F14 | Delivery sensor 2 fault |
OPTIMAX HE PLUS 31C boiler / OPTIMAX HE PLUS 38C |
F15 | Fan fault |
DOMIcondens HE 26 C | A16 | Gas valve fault |
DOMIcondens HE 26 C | F20 | Combustion control fault |
DOMIcondens HE 26 C | A21 | Poor combustion fail |
DOMIcondens HE 26 C | A23 | Set nominal system water pressure not reached within 4 minutes |
DOMIcondens HE 26 C | A24 | 4 fillings within 24 hours |
DOMIcondens HE 26 C / OPTIMAX HE PLUS 31C boiler / OPTIMAX HE PLUS 38C |
A34 | Supply voltage under 170V / 180V |
DOMIcondens HE 26 C | A35 | Faulty mains frequency |
OPTIMAX HE PLUS 31C boiler / OPTIMAX HE PLUS 38C |
A35 | Mains frequency anomaly |
DOMIcondens HE 26 C / OPTIMAX HE PLUS 31C boiler / OPTIMAX HE PLUS 38C |
A37 | Incorrect system water pressure |
DOMIcondens HE 26 C / OPTIMAX HE PLUS 31C boiler / OPTIMAX HE PLUS 38C |
A39 | External probe fault |
DOMIcondens HE 26 C / OPTIMAX HE PLUS 31C boiler / OPTIMAX HE PLUS 38C |
A41 | Sensor positioning |
DOMIcondens HE 26 C / OPTIMAX HE PLUS 31C boiler / OPTIMAX HE PLUS 38C |
F42 | Heating sensor fault |
DOMIcondens HE 26 C | A43 | Exchange protection activation |
DOMIcondens HE 26 C | A50 | Gas valve fault |
DOMIcondens HE 26 C | A51 | Poor combustion fault |
OPTIMAX HE PLUS 31C boiler / OPTIMAX HE PLUS 38C |
A62 | No communication between electronic controller and gas valve |
Alpha Boiler Fault Codes |
||
Fault Code | Fault | Possible Cause |
1 | Ignition failure | Gas supply, pressure tubes, ignition electrode, flame sensor electrode, ignition generator, lead flame sensor, electrode lead, gas valve setting, gas valve printed circuit board (PCB) |
2 | Overheat boiler lock out | Pump or flow problem, blocked heat exchanger, air in heat exchanger, overheat thermostat, thermal fuse (if open circuit then replace primary heat exchanger) |
3 | High flue thermostat temperature | Blocked or restricted primary flow, heat exchanger air flow blocked, flue restriction, flue sensor fault |
4 | Gas valve electrical connection fault | Gas valve lead connection fault, faulty gas valve or faulty printed circuit board (PCB) |
5 | Heating flow sensor fault | Flow sensor wire connections, flow sensor faulty |
6 | Domestic how water (DHW) sensor fault | DHW sensor wiring connection or DHW sensor faulty |
8 | Maximum number of resets | Refer to fault history codes |
10 | Primary system pressure low | Check expansion vessel pressure (1 bar), leak in system, expansion relief valve operated or primary pressure switch |
12 | Cylinder sensor fault (FlowSmart only) | Cylinder sensor wiring connections or cylinder sensor faulty |
15 | Internal wiring error | Check internal wiring connections to printed circuit board (PCB), Combi boiler domestic hot water (DHW) sensor X4, System boiler link X14 |
16 | Fan fault | Fan wiring connections, fan fault or printed circuit board (PCB) fault |
20 | Flame sensing fault | Check flame sensing electrode and lead printed circuit board (PCB) fault |
24 | Control panel button fault | Jammed control panel or printed circuit board (PCB) buttons |
25 | Overheat lock out | Air in heat exchanger, blocked or restricted primary flow, heat exchanger air flow blocked, flue restriction, flue sensor fault, pump fault, boiler or heating circuit valve closed |
27 | Insufficient primary flow | Blocked or restricted primary flow, air in heat exchanger, boiler or heating circuit valve closed, pump fault or primary flow sensor fault |
29 | Flue sensor fault | Sensor wiring connection or flue sensor faulty |
31 | Loss of communication with external control (Alpha Climatic) |
Remote control or receiver connection wiring |
37 | Low supply voltage | Check mains power supply |
38 | Loss of flame rectification | Flame sensing electrode and lead, check flue gas recirculation, check the gas valve settings and check the fan speed settings |
43 | Loss of flame rectification | Check gas supply working, check flame sensing electrode and lead, check for flue gas recirculation, check the gas valve settings, check the fan speed settings |
44 | Safety lock out | Check external control (room thermostat) requests and rapid on/off hot tap requests |
46 | External sensor intervention | External sensor and cable damaged or wet, continuity of external sensor and circuit, check connection at X19 on printed circuit board (PCB) and sensor connecting block |
47 | Reduced burner output | Air in heat exchanger, restricted primary flow, heat exchanger air flow blocked, flue restriction, flue sensor fault or pump fault |
51 | Climatic RF communication fault | Batteries need replacing, distance between boiler and climatic control too great, interference object blocking signal (metallic) |
E-Tec, E-Tec Plus, Evoke Combi Boilers Error Codes |
||
Fault Code | Fault | Possible Cause |
60 | Pump error (stuck or there is an electrical pump fault) |
Pump operation (may need to free the pump shaft), issue with pump wiring or pump replacement needed. |
61 | Air in the pump (restricted central heating flow) |
Flow and Return valves may not be open, iIncorrect system pressure, system not purged properly or flow return valves are open. |
70 | Return/flow sensor Exchange from possible wiring fault |
Issues with sensor wiring and connections. Issues with sensor resistance. |
75 / 76 | Return/flow sensor fault from possible failure of one or both sensors |
Issues with sensor resistance. |
SR | Service reminder | Service reminder countdown has reached 0 (this will not stop boiler from working) – boiler needs servicing. |
Protec Plus Error Codes |
||
Fault Code | Fault | Possible Cause |
0A1 | Ignition failure | Issue with gas supply. Ignition electrode position and spark issues. |
0A2 | Flame detection fault | Flame sensing electrode connections. A short circuit to the electrode or wires. |
0A3 | Overheat thermostat lock-out | Flame sensing electrode connections. A short circuit to the electrode or wires. |
0A5 | Fan speed fault | Problem with flue /ventilation. Issue with air inlet manifold and pipe. Damage or fault with fan. Fan wire connections. |
0A7 | High flue temperature fault | Air in the primary heat exchanger. System restrictions causing overheating. Flue run may have restrictions or blockages. |
0A8 | Flame circuit fault | Incorrect gas supply. Ignition electrode position and spark. Issues with flame sensing electrode gap and connections. |
0A9 | Gas valve electrical error | Valve connection issues. Main PCB. Gas valve operation issues. Gas contamination. |
0A15 | Flow and return sensor anomaly detected. (incorrect temperature value shown on sensor.) |
Poor or incorrect circulation. External circuit influences. Problem with resistances of flow and return sensors. |
0A16 | Flow sensor temperature rise incorrect (time taken for flow temperature to rise is too long.) |
System circulation issues. System volume or flow is too high. Boiler output is insufficient for the system. |
0A17 | Return sensor temperature rise incorrect (time taken for flow temperature to rise is too long.) |
System circulation issues. System volume or flow is too high. Boiler output is insufficient for the system. |
0A18 | Flow and return sensor anomaly detected. Sudden temperature change detected on the flow or return sensor. |
System circulation issues. Problem with operation of zone valves. Resistances and function of flow and return sensors needs checking. |
0A21 | Main PCB fault | Electrical connections. Water ingress in connections. |
0A30 | Flow sensor short circuit | Flow sensor connections and wires need checking. Water ingress in connections. |
0A31 | Flow sensor out of range. (sensor measures a temperature not in normal range.) |
Problem with flow sensor connections and damaged wires. Sensor resistance values wrong. |
0A37 – Pro Tec 50 | Insufficient system flow (if the system flow is too low for a certain length of time boiler will switch off) |
Flow switch reading needs checking. Restrictions or shut valves in system. Pump function issues. System pressure issues. |
0A37 – Pro tec 70, 90, 115 | Insufficient system pressure (if the system pressure is too low the boiler switches off.) |
System pressure needs to be 1 – 2 bar if its not the pressure needs refilling to the correct amount |
0A43 | Return sensor short circuit | Problem with return sensor connections and wires. Water ingress in connections |
0A44 | Return sensor out of range. Sensor measures a temperature outside normal working range |
Return sensor connections and damaged wires. Return sensor resistance values need checking. |
0A80 | Flow and return sensor connection fault (may occur after several minutes of boiler operation.) |
Wires are not connected to the correct sensors. |
0.00E+00 | Flame sensing fault. | Flame sensing electrode connections need checking. Short circuit to the electrode or wire. |
0.00E+00 | Maximum number of resets reached. (Over 5 reset attempts have been reached within 15 minutes.) |
Investigate initial fault code displayed. Power supply needs to be turned Off/On to clear this code |
0.00E+00 | Main PCB fault | All electrical connections need to be checked. Water ingress in connections. |
0.00E+00 | DHW sensor out of range (measures a temperature outside normal working range.) |
DHW sensor connections and damaged cables. Issues with DHW sensor resistance values |
0.00E+00 | Low power supply voltage | Electrical socket connection issues. Problem with external power supply. Possible power disruptions |
0.00E+00 | Insufficient system pressure | System needs checking for circulation and restrictions. System pressure and gauge needs checking. Pressure switch and connections need checking. |
0.00E+00 | Flue sensor short circuit | Flue sensor connections and wires need checking. Water ingress in connections |
0.00E+00 | Flue sensor out of range (measures a temperature outside of normal working range) |
Flue sensor connections, wires and flue sensor resistance values need checking. |
0.00E+00 | Flow and return sensor anomaly detected (the sensor shows an incorrect temperature value) |
Poor or incorrect circulation / external circuit influences resistance of flow return sensors need checking |
0.00E+00 | Flow and return sensor anomaly detected (sensor shows incorrect temperature value) |
M to O Connections need checking Compatible software on PCB needs checking |
0.00E+00 | Simple cascade communication error | Wiring connections needs checking on all boilers. Configuration, parameter 38. |
FE94 | Display PCB fault. | Electrical connections to display board need checking. Water ingress in connections. Damage to buttons or LCD screen. |
FE95 | External flow sensor out of range or short circuit/ External flow sensor measures a temperature outside of normal working range. |
External flow sensor connections and wires need checking for damage. External flow sensor resistance values need checking to make sure they are between 5 and 0 |
FE96 | External sensor fault | External sensor connections and wires need checking. Water ingress in connections. Boiler parameter settings are incorrect. |
FE97 | Boiler PCB configuration error (may occur if the main PCB or display PCB is changed.) |
All electrical connections. Incorrect parameter settings on PCB. Press ‘-‘ CH button until ‘AUTO’ appears, then press and hold ‘RESET’ button until ‘bu1’ appears |
Alpha Flashing Light Errors Codes |
||
Fault Code | Fault | Possible Cause |
No lights on | Electricity fault | Check your electricity supply |
Illuminated red A or B | Burner has failed to light | Rotate selector switch to the reset position (3) and the ignition sequence will restart after a delay of about 30 seconds |
Illuminated yellow B or C | Burner is alight | No action required |
Flashing red A or B | Overheat thermostat has operated / Temperature sensor fault |
Rotate selector switch to the reset position (3) to reset |
Flashing yellow every 5 seconds or illuminated green D |
Electrical supply to the boiler is on | No Action Required |
Flashing yellow B or flashing Red A |
Temperature sensor fault | |
Illuminated red A and flashing yellow B or Flashing red A and flashing red B |
Blocked flue or fan fault | |
Flashing yellow or flashing Red A or Flashing (alternating) red A and flashing (alternating) yellow B |
System pressure is very low and re-pressurisation is required |
|
Illuminated red A and flashing yellow B |
Pump fault or restricted flow | |
Flashing red A and Flashing red B and flashing yellow C |
Temperature sensor wiring or flow and return connections incorrect |
|
Flashing red A and flashing red B and flashing yellow C indicators |
Flue temperature too high (air in the heat exchanger, heat exchanger blocked |
|
Alpha E-Tec Regular Gas Boiler Error Codes |
||
Fault Code | Fault | Possible Cause |
1 | Ignition failure | Check the gas supply, pressure tubes, ignition electrode, flame sensor electrode, ignition generator or lead flame sensor, gas valve setting and PCB. |
2 | Overheat boiler lockout | Pump or flow problem. Caused by a blocked heat exchanger, air in heat exchanger, overheated thermostat, thermal fuse (if open circuit then replace primary heat exchanger). |
3 | High flue thermostat temperature | Blocked or restricted primary flow. Heat exchanger air flow blocked, flue restriction, flue sensor fault. |
4 | Gas valve electrical connection fault | Gas valve lead connection fault. Faulty gas valve or faulty PCB. |
5 | Heating flow sensor fault | Flow sensor wire connections. Flow sensor faulty. |
6 | Internal wiring error | Incorrect wiring configuration detected. Internal wiring connections to PCB need checking. |
7 | Chimney sweep function is active | Chimney sweep function is active. E07 is displayed on the climatic remote control. |
8 | Maximum number of resets | Refer to fault history codes (INFO menud9) |
12 | Cylinder sensor fault (FlowSmart only) | Cylinder sensor wiring connection – cylinder sensor faulty. |
16 | Fan fault | Check fan wiring connection, fan fault or PCB fault. |
20 | Flame sensing fault | Check flame sensing electrode and lead PCB for faults. |
23 | Heating return sensor fault | Incorrect return sensor resistance value – return sensor wire connections or sensor could be faulty. |
24 | Control panel button fault | Control panel button is stuck in the ‘on’ position – check for jammed control panel buttons or jammed PCB button. |
27 | Insufficient primary flow | Blocked or restricted primary flow. Air in heat exchanger, boiler or heating circuit valve closed, pump fault or primary flow sensor fault. |
29 | Flue sensor fault | Check sensor wiring connection – flue sensor faulty. |
31 | Loss of communication with external control (Alpha Climatic) |
Remote control or receiver connection wiring. |
37 | Low supply voltage | Check mains power supply. |
38 | Loss of flame rectification | Check flame sensing electrode and lead and for flue gas recirculation. Check or adjust the gas valve settings. Check or adjust the fan speed settings. |
43 | Loss of flame rectification | Check gas supply/working pressure, flame sensing electrode and lead, check for flue gas recirculation, check/adjust the gas valve settings, check/adjust the fan speed settings. |
44 | Safety lockout | Check external control (room thermostat) requests. Rapid on/off hot tap requests. |
45 | High-temperature difference | The boiler is detecting an unexpected increase between the system flow and return sensors. Boiler output is limited for boiler protection and once restored the boiler resumes regular operation. |
46 | Optional thermostat intervention | No continuity of optional thermostat circuit – check the optional thermostat and cable are not damaged or wet. |
47 | Reduced burner output | Flue thermostat has sensed high flue gas temperature and reduced the burner output to prevent damage. If the temperature continues to rise the boiler will lockout and the E03 error code will be displayed. This could be due to air in the heat exchanger, restricted primary flow or heat exchanger air blocked. |
49 | Return sensor high temperature intervention |
Return sensor has detected a high temperature on the exchanger return circuit. |
51 | Climatic RF communication fault | The error between the communication of the climatic transmitter and boiler receiver. Could mean the batteries need replacing or the distance between the boiler and climatic control is too great or a metal object is blocking the signal. |
70 | Return flow sensor error | Possible wiring faults sensor is incorrectly fitted or the system is blocked – check the sensor wiring and connections, also check sensor resistance and circulation. |
71 | No primary temperature increase detected | From ignition the boiler detects no temperature rise in the primary circuit – check system filling and venting, air locks preventing flow check, blocked flow or closed valves. |
Ariston Error Codes |
||
Fault Code | Boiler Model | Possible Cause |
Central Heating Circuit | ||
101 | All Boilers | Overheat |
102 | E-Combi Evo E-System Evo Clas He Evo (Combi and system) |
Pressure sensor error |
103 | All Boilers | Insufficient circulation |
104 | All Boilers | Insufficient circulation |
105 | All Boilers | Insufficient circulation |
106 | All Boilers | Insufficient circulation |
107 | All Boilers | Insufficient circulation |
108 | All Combi Boilers | Insufficient water (request filling) |
109 | Clas net one / Clas one Combi Clas system one |
System pressure greater than 3 bar |
110 | All Boilers | Central heating Flow temperature probe circuit open / short circuit |
112 | All Boilers | Central heating return temperature probe circuit open / short circuit |
114 | All Boilers | External sensor circuit open / short circuit |
116 | All Combi and System Boilers | Floor thermostat contact open |
118 | All Boilers | Heating delivery probe problem |
1p1 | All Boilers | Insufficient circulation indication |
1p2 | All Boilers | Insufficient circulation indication |
1p3 | All Boilers | Insufficient circulation indication |
1p4 | Clas Net one Combi Clas one Combi Clas System one |
Insufficient circulation indication |
D.H.W Circuit | ||
202 | Clas HE evo Clas he evo system E-combi evo E-system evo |
2 bottom storage temperature probe open/short circuit |
204 | Clas HE evo Clas he evo system E-combi evo E-system evo |
Solar collector temperature probe open/short circuit |
205 | E-combi one E-System one Clas Net one Combi Clas one Combi |
Domestic hot water in probe open circuit |
207 | Clas HE evo Clas he evo system E-combi evo E-system evo |
Solar collector overheating |
208 | Clas HE evo Clas he evo system E-combi evo E-system evo |
Collector frost protection temperature |
Internal printed circuit board (PCB) | ||
301 | All Boilers | EEPROM error |
302 | All Boilers | Communication error |
303 | All Boilers | Main printed circuit board (PCB) error |
304 | All Boilers | Too many resets (> 5) in 15 minutes |
305 | All Boilers | Main printed circuit board (PCB) error |
306 | All Boilers | Main printed circuit board (PCB) error |
307 | All Boilers | Main printed circuit board (PCB) error |
3P9 | E-combi one E-System one Clas Net one Combi Clas one Combi Clas System one |
Schedule service |
External printed circuit board (PCB) | ||
407 | Clas HE evo Clas he evo system E-combi evo E-system evo |
7 Room sensor circuit open/short circuit |
Ignition and Detection | ||
501 | All Boilers | No flame detected |
502 | All Boilers | Flame detected with gas valve closed |
504 | All Boilers | Flame lift |
5P1 | All Boilers | 1st ignition failed |
5P2 | All boilers | 2nd ignition failed |
5P3 | All Boilers | Flame cut-of |
Air Inlet / Flue gas outlet | ||
604 | CLAS HE R E-Combi Evo E-System EVO Clas HE evo Combi Clas HE evo System |
Insufficient fan speed |
610 | All Boilers | Thermofuse open |
612 | Clas HE Evo Combi Clas He Evo System E-Combi Evo E-system Evo Clas net one combi Clas one combi Clas system one |
Fan speed has incorrect measurement |
Multi-zone Heating | ||
701 | E-Combi Evo E-System EVO Clas HE evo combi Clas he evo system |
Zone 2 outgoing sensor defective |
702 | E-Combi Evo E-System EVO Clas HE evo Combi Clas HE evo System |
Zone 2 return sensor defective |
703 | E-Combi Evo E-System EVO Clas HE evo combi Clas he evo system |
Zone 3 outgoing sensor defective |
704 | E-Combi Evo E-System EVO Clas HE evo Combi Clas HE evo System |
Zone 3 return sensor defective |
705 | E-Combi Evo E-System EVO Clas HE evo combi Clas he evo system |
Hydraulic separation sensor defective |
706 | E-Combi Evo E-System EVO Clas HE evo combi Clas he evo system |
Zone 2 overheating |
707 | E-Combi Evo E-System EVO Clas HE evo Combi Clas HE evo System |
Zone 3 overheating |
Clas Net One, Clas One, E-Combi and E-System Error Codes |
||
Fault Code | Possible Cause | |
External printed circuit board (PCB) | ||
411 | Room sensor circuit open or short circuit zone 1 | |
412 | Room sensor circuit open or short circuit zone 2 | |
414 | Room sensor circuit open or short circuit zone 3 | |
Multi-zone Heating | ||
701 | Send sensor defective (Zone 1) | |
702 | Send sensor defective (Zone 2) | |
703 | Send sensor defective (Zone 3) | |
711 | Return sensor defective (zone 1) | |
712 | Return sensor defective (zone 2) | |
713 | Return sensor defective (zone 3) | |
722 | Overheating in zone 2 | |
723 | Overheating in zone 3 | |
750 | All heating zones locked |
ATAG Boiler Error Codes |
|
When your ATAG boiler has an error, you will see an error symbol. This symbol is normally accompanied by one of the codes in the tables below. | |
Fault Code | System Behaviour |
10 | Outside sensor error |
20 | Flow sensor error |
40 | Return sensor error |
61 | Bus communication error |
78 | Water pressure out of range |
105 | Venting program active when power turned on / interrupted (runs for 7 mins) |
110 | Exceeded safety temperature |
111 | Exceeded maximum pressure |
119 | X2 link position 4 and 5 missing |
129 | Fan doesn’t start |
133 | No flame after 5 ignition attempts |
151 | Fan error or control unit defective (speed control is not achieved) |
154 | Return greater than flow – flow temperature increases too fast |
101 | Overheat error |
102 | Pressure sensor fault |
104 | Flow check failed |
108 | Pressure needs filling to < 0.5 bar |
1P4 | Pressure needs filling to 0.5 – 0.8 bar |
109 | Pressure > Pmax error |
110 | Send probe damaged |
112 | Return probe error – could be damaged |
114 | Outdoor sensor error – could be damaged |
141 | Central heating flow switch is open |
201 | Domestic hot water (DHW) probe damaged |
203 | Tank probe damaged |
303 | Printed circuit board (PCB) error |
304 | Too many resets have occurred |
501 | No flame detected |
612 | Fan fault – fan isn’t starting up |
IC & IS Combi Boiler Error Codes |
|
Fault Code | System Behaviour |
50 | Domestic hot water (DHW) sensor error |
117 | Pressure greater than 3 bar or pump pressure increase is too high |
118 | Pressure less than 1 bar or pump pressure increase too low (no pump detection). |
Other Fault Codes | |
If you see a spanner symbol this could be one of two things; firstly it could mean your boiler is in service mode. Secondly it could be blocking, if the boiler is blocking the code is only temporary and will clear itself or will lock the boiler after several attempts if the error keeps on occurring. |
|
ATAG Error code 133 | |
If you are seeing the error code 133, your boilers flame is failing after 5 ignition attempts. This could be down to your condensate drain pipe freezing. A frozen condensate pipe is something that is often easily fixed, you can find out how in this guide to defrosting a condensate pipe. |
Biasi Boiler Error Codes |
| |
Fault Code | Fault Image | System Behaviour |
ER 01 + Reset | N/A | Lack of burner ignition on safety lockout |
ER 02 + Reset | N/A | Safety thermostat intervention lockout |
ER 03 + Reset | N/A | General lockout |
ER 04 + | Faulty primary circuit (no water or absence of flow) | |
ER 05 + | Faulty fan control system | |
ER 06 + | Faulty c.h. temp. probe NTC | |
ER 07 + | Faulty d.h.w. temp. probe NTC | |
ER 08 + | Faulty external temp. probe NTC | |
ER 09 + | Faulty flue temp. probe NTC | |
ER 10 + reset | N/A | Flue probe intervention lockout |
N/A | Flame detection error (An flashing + number error flashing | |
ER + 14 + Reset | N/A | Faulty pump or primary temperature above 105°C |
ER + 14 + Reset | N/A | Faulty pump or primary temperature above 105°C |
ER + 14 + | Absence of flow from temperature gradient (>2K/s)/td> | |
Li | N/A | Primary circuit temp. limit during d.h.w. operation |
— | N/A | Boiler Stand-By, hyphens are turned on in sequence to simulate running /antifreeze protection activated) |
N/A | Boiler Stand-By, hyphens are turned on in sequence to simulate running /antifreeze protection activated) | |
N/A | Filling request: The boiler works regularly and the display shows all the icons, but the signal FL is flashing every 1 sec. | |
N/A | Insufficient pressure: The boiler stops displaying the water lack error. | |
30c | N/A | Boiler waiting for heat request |
N/A | Boiler in summer mode (d.h.w.). The primary circuit temperature is displayed. | |
N/A | Boiler in winter mode (c.h.+ d.h.w.) The primary circuit temperature is displayed. | |
N/A | Boiler on demand for d.h.w. power. The d.h.w. temperature is displayed. / Boiler on demand for c.h. power. | |
N/A | Burner ignition (spark) | |
N/A | Flame present (Burner on) | |
N/A | Pre-heating function 3 stars DHW comfort. This information is not displayed. It will be possible to check its state in the section “INFO” value “cF” (the signal “cF” is alternated to the CH temperature value until the end of this function). You can enter the function pushing the buttons 12 and 13 together. The function is confirmed showing ON or OFF alternating for 5 sec. This function is always active at every hour (it’s not possible to set the time slots unless a remote control is connected). |
|
N/A | Pre-heating function 3 stars DHW comfort. This information is not displayed. It will be possible to check its state in the section “INFO” value “cF” (the signal “cF” is alternated to the CH temperature value until the end of this function). You can enter the function pushing the buttons 12 and 13 together. The function is confirmed showing ON or OFF alternating for 5 sec. This function is always active at every hour (it’s not possible to set the time slots unless a remote control is connected). |
|
N/A | Boiler in anti-freeze phase (bP flashing + temperature flashing) | |
N/A | Boiler in antifrost phase (AF flashing + temperature flashing) | |
N/A | Set c.h. (all other symbols are disabled) | |
N/A | Set d.h.w. (all other symbols are disabled) | |
N/A | Pump activated for the post-circulation phase (Po flashing + temperature flashing) | |
N/A | Delayed burner ignition for setting the system (uu flashing + temperature flashing) | |
N/A | Maintenance required The wrench symbol is flashing (without showing any error) | |
LP | N/A | Boiler in chimney sweep in function. The activation of the chimney sweep occurs configuring the “parameter P09=01” and is visualised: LP= minimum dhw hP= minimum heating cP= maximum heating dP= maximum dhw. The transition occurs with keys 16 (increase) and 15 (decrease) dhw temperature. The writing on the display alternates. |
N/A | Boiler in chimney sweep in function. The activation of the chimney sweep occurs configuring the “parameter P09=01” and is visualised: LP= minimum dhw hP= minimum heating cP= maximum heating dP= maximum dhw. The transition occurs with keys 16 (increase) and 15 (decrease) dhw temperature. The writing on the display alternates. |
D2CND Combi Gas Boiler Error Codes |
|
Fault Code | Possible Cause |
10-64 | Gas valve circuit error, try resetting boiler |
10-65 | Gas valve current fault, try resetting the boiler |
11-64 | Ignition error – possible fault with valve on the gas line due to it being open. Try resetting the boiler after the third unsuccessful ignition. |
11-65 | Flame stabilisation error – wait for the boiler ignition trial |
11-66 | Flame Signal loss in safety time – try to reset the boiler after 3rd unsuccessful ignition |
11-67 | Flame loss during operation. This is a temporary error, wait for the boiler to re-ignite. |
12-64 | Ion control deviation is too big – try resetting the boiler |
12-65 | Ignition scott actuators error – try resetting the boiler |
12-66 | Ion base value lower than the upper factory limit, try resetting the boiler |
12-67 | Ion base value exceeds the upper factory limit – try resetting the boiler |
12-68 | Ion base value differs from the previous value – try resetting the boiler |
12-69 | Offset adaptation at limit |
13-64 / 13-65 | Fan speed error – try resetting the boiler |
16-64 | Flue temperature signals overheating, the flue gas discharge path needs checking. Try resetting the boiler |
1J-64 | High limit thermostat signalising overheating. Check the valve of the radiators in the heating, check if the Combi boiler water pressure is low, if it is then the heating circuit needs filling with water |
80-01 | Return temperature sensor error – reset the boiler |
81-01 | Flow temperature sensor error – try resetting the boiler |
81-65 | Domestic hot water (DHW) temperature sensor error. The boiler will continue in operation but solar sensor has an error . |
8A-46 | Freeze protection – the boiler won’t operate if flow temperature sensor reads a value that is less than 1°c |
8H-65 | Flow temperature steep rise – the radiator valves may not be open enough to circulate water |
E1-64 | Flame detected before burner operation – try resetting the boiler |
E1-65 | Internal SCOT system error. Perform reset if needed |
E1-66 | Calibration condition error, wait for burner to restart |
E1-67 | Missing calibration – try resetting the boiler |
E1-68 | Ion base value is outside the factory limits or saved incorrectly – try resetting the boiler |
E1-69 / E1-70 | Parameter CRC fault – try resetting the boiler |
E1-71 | EK lockout failure – this is a permanent error |
E1-72 | SCOT flame amplifier – reset the boiler |
E1-73 | Printed circuit board (PCB) error – try resetting the boiler |
H9-01 | Outside sensor fault – try resetting the boiler |
HC-01 | Domestic hot water (DHW) temperature sensor error. The boiler will continue to operate but you need to contact a heating engineer |
HJ-08 | High system pressure – the boiler needs to discharge water down to 0.8 bar |
HJ-09 | Low system pressure – increase the system pressure to 0.8 bar |
HJ-10 | Water pressure sensor fault |
J6-01 | Flow temperature sensor overheating due to a blocking fault or a lockout error – the valves of the radiator heating circuit may have an issue or the water pressure is low and needs filling |
J6-20 | Return temperature sensor overheating due to a blocking fault or a lockout error – try resetting the boiler |
J6-21 | Return temperature is higher than flow temperature. Burner operates itself after a small amount of time but if the problem repeats you need to contact a heating engineer |
JJ-64 | Supply voltage is below low limit |
U2-01 | Supply voltage is above high limit, your boiler should continue to operate but you need to contact a heating engineer |
U4-65 | OpenTherm room thermostat connection is defective – your boiler will continue to operation but the thermostat is out of operation |
U4-66 | CAN-bus timeout |
U4-67 | Remote reset supervision, switch off the power at the mains – if problem repeats contact a heating engineer |
UA-64 | Blocking during boiler chip card (BBC) update |
UA-65 | Printed circuit board (PCB) requires a boiler chip card (BCC) update |
UA-66 | Boiler chip card ID (BCC-iD) of internal Electrically Erasable Programmable Read-Only Memory (EEPROM) is inconsistent |
UA-67 | Boiler chip card (BCC) is missing |
Error Code HJ-08 | If you are seeing the error code HJ-08 this could be due to a high system pressure. To resolve this issue you need to discharge the water down to 0.8 bar. As well as this, you should also bleed your radiators. To do this check out our handy guide to bleeding radiators. |
Firebird Boiler Error Codes |
|
Fault | Possible Cause |
E1 | Control thermistor fault |
E2 | Flue thermistor fault |
E3 | Flue thermistor fault |
E5 | Burner fault (possibly burner lockout) |
Thermostat at a high limit (cuts off) | Reset boiler |
Occasionally some things can go wrong, that’s why we’ve created our handy at-a-glance table of Firebird error codes and a guide to Common Firebird Problems and Repair. |
|
Should you need professional help with your broken boiler, then simply use one of our enquiry forms and we will connect you with the best heating engineers local to you. |
Grant Boiler Error Codes | |
Fault Code | Cause of Problem |
No display | 12V transformer failure |
PP1 | Inlet (return) water temperature sensor failure |
PP1 | Inlet (return) water temperature sensor failure |
PP2 | Discharge gas sensor failure |
PP3 | Coil temperature sensor failure |
PP4 | Return gas sensor failure |
PP5 | Ambient temperature sensor failure |
PP6 | Discharge gas overheat protection |
PP7 | Winter anti-freeze protection in operation |
EE1 | High pressure – circulating pump failure or circuit air locked |
EE2 | Low pressure |
EE3 | Open circuit between PCB terminals 23-24 |
EE4 | Supply L and N are reversed |
EE8 | Communication failure |
Flashing on and off | Defrosting |
E01 | Internal control fault |
sHr | HP flow sensor short / HP return sensor short |
OPn | HP flow sensor open / HP return sensor open |
SUP | Supply sensor short / Supply sensor open |
OUTDR | Outdoor sensor short / Outdoor sensor open |
C2849 | Fault C; Chassis Code Problem is controller area network wiring bus and modules. fault two; MFG – Manufacturer Specific Fault eight; Ignition System Or Misfire fault four; BBV Sensor Circuit Low Voltage fault nine; Kick-Down Switch Failed Short |
U2453 | Fault U: Network Code Problem is climate control system, lighting, airbags, etc.. fault two; MFG – Manufacturer Specific fault four; Transmission fault five; TP Sensor Learn Not Complete fault three; Transmission Control Module Reprogrammable Memory |
Grant Boiler Error Description |
|
Grant Fault | Fault Description |
Boiler Will Not Start | Low pressure cut-out activated No electrical supply to burner Check controls are switched on and calling for heat Boiler thermostat and/or overheat thermostat faulty |
Burner lights but goes to lock-out | Fault with burner No fuel supply Oil tank empty Fire valve closed Fire valve closed. Fuel line filter is blocked Oil supply line is air locked Excessive combustion air Fault with burner |
Burner fires but smoke visible from flue or high smoke number |
Insufficient combustion air supply to burner Incorrect or faulty nozzle fitted Fuel pressure too high |
Burner pulsates | Insufficient combustion air supply to burner |
Burner cycles On and Off | Contaminated combustion air (balanced flue) Insufficient oil flow to burner due to restriction in supply line Excessive combustion air |
Fumes and puffing on starting | Flue is blocked Insufficient flue draught Flue pipe or liner is too large or existing stack is unlined Insufficient combustion air supply to burner |
Flame slow to stabilise on starting | Insufficient combustion air supply to burner Fuel pressure too low |
Oil smells | Oil leak in supply line or burner |
Combustion fume smells | Leak around boiler cleaning door Burner not correctly fitted on mounting flange Burner seal ‘O’ ring damaged or missing. Leakage around flue connection |
Overheat thermostat operating | Faulty boiler thermostat Thermostat sensor not connected to printed circuit board (PCB) – Vortex Combi only Faulty overheat thermostat |
No water flowing from hot tap | Mains water supply is not connected to cold water inlet of boiler One or more isolating valves, stop cocks, etc. in the pipework are closed The cold water isolating valve in the boiler is closed There is a blockage (or blockages) in the pipework |
No hot water operation | Hot tap is not connected to hot water outlet of boiler Insufficient flow of water through boiler Boiler cold water and hot water connections reversed Thermostatic mixing valve incorrectly fitted Pump is not operating in hot water mode Diverter valve microswitch(es) faulty Diverter valve microswitches not operated Diverter valve seized Diverter valve diaphragm failed |
Low water temperature at tap | Flow of water through boiler too high Boiler thermostat incorrectly set Thermostatic mixing valve incorrectly set Faulty boiler thermostat Pump speed setting too low Pump is incorrectly fitted |
Hot water for short period only | Burner not firing for hot water (after a short time) Burner oil pressure set too low at oil pump Incorrect oil nozzle fitted to burner |
No operation on heating | Timeswitch either not set, or not in an ‘ON’ period Timeswitch not operating Faulty timeswitch Faulty timeswitch switch contacts Timeswitch OK but not switching boiler on Heating switch set to ‘HOT WATER ONLY’ Room thermostat not calling for heat Faulty room thermostat No room thermostat or external timeswitch connected to boiler |
Flow temperature low | Boiler thermostat is set too low Boiler thermostat faulty Boiler is underfired Combustion setting of burner incorrect Boiler heat exchanger is sooted up |
Grant Vortex / Eco / Pro Boiler Error Codes | |
Fault Code | Cause of Problem |
No fuel supply | Insure that an adequate supply of fuel is available and that the fuel supply valve is open – check the condition of the fuel filter and clean if necessary, ensure fuel supply is reaching burner and vent pump |
No Electricity Supply | Ensure electricity supply to the boiler is switched on and that all controls are calling for heat – ensure that the overheat thermostat has not tripped, reset if necessary and check the mains supply |
Burner not starting – fuel and electricity supplies present |
Reset boiler on the burner control box – if it is lit refer to burner fault finding charts |
Burner lights but goes to lock out | If the flame is unstable check the combustion setting |
Visible smoke from flue or high smoke number | Insufficient air supply. Check the air damper setting and the condition of the fan check room ventilation, check the nozzle size and type, fuel pressure may be too high, check and adjust |
Burner pulses | Insufficient air supply – check the air damper setting and the condition of the fan, check room ventilation |
Flame slow to stabilise during start up | Insufficient air supply – Check the nozzle size and type as fuel pressure may be too low, check and adjust insufficient draught clean boiler heat exchanger and check condition of flue |
Water temperature low | Undersize nozzle and or low fuel pressure check condition of boiler heat exchanger and clean if necessary. Check the boiler thermostat, check the combustion setting, check the condition of the fuel filter |
Boiler operating an overheat thermostat | Faulty boiler thermostat – no circulation, check circulating pump, check for air lock |
Fumes and puffing during starting | Check the condition of the chimney to ensure it is not blocked and is high enough to produce the required draught – check that there is an adequate air supply near the burner fan is not drawing products out of the burner |
Oil odours | Check all fuel line connections and remake as necessary |
Combustion fumes smell | Check boiler cleaning cover and seal are correctly fitted, check burner is correctly fitted onto flange, check flue is correctly sealed into flue outlet of boiler, check the condensate pipe and trap are operating correctly |
Grant Vortex Blue Error Codes |
|
Fault Code | Cause of Problem |
Red blinking light | Presence of a false flame signal before heat request |
Red blinking light | Presence of false flame signal during pre-purging |
Red blinking light | Presence of false flame signal during post-purging or pre-heating |
Red steady on | UV sensor defective or dirty oil valve defective fault – ignition transformer badly regulated burner, oil fuel not present |
Red blinking light | Badly adjusted burner, oil valve defective or dirty UV sensor defective or dirty |
Red and orange blinking inverted | Error with oil valve internal control circuit that drives the oil valve error |
Red green blinking inverted | Internal memory error |
Orange green blinking inverted | Check presence of voltage, check the condition of the fuses, check that safety thermostat is not in lockout |
Off | Eliminate the extraneous light |
Off | Check that plugs and sockets are connected properly |
Red blinking light | Eliminate the extraneous light |
Red steady on | Clear it / replace it / check the pressure and output of the fuel / check air output change nozzle check the coil od solenoid valve |
Green blinking light | Set the air according to the instructions of the manual or replace |
Grant Vortex Eco Error Codes |
|
Fault Code | Cause of Problem |
Motor fails to run | No electrical supply to boiler check on/off switch is on – it should be neon lit |
Lock-out light not lit | Fuse has blown – check reason for failure |
Motor fails to run | No power to burner motor |
Burner lock out | Burner motor capacitor fault check and replace if necessary |
Grant Vortex Pro Combi Error Codes |
|
Fault Code | Cause of Problem |
Power supply | Check that fused spur for heating system and boiler is switched on – check that the electricity supply has not failed |
Heating system controls | Check that the timer or programmer is working and set to an on period |
Boiler controls | Check boiler on/off switch is set to on – check that power indicator on and control panel is lit |
Burner | Check the burner lockout reset button is lit, if yes press the reset button to start the burner if burner fails call an engineer |
Heating system | Check the heating system water pressure |
power | If the boiler is not lit it could be a problem with power supply to the boiler switched off or possibly blown a fuse |
DHW pump | If flashing this indicates either a store thermistor or PCB fault |
Flow | If the boiler is not lit when a hot tap is opened this could mean there is a lack of water flow or possible flow switch problem |
Demand | If not lit this indicates either timer or programmer is not calling for hot water / switch is not set to constant |
Burner | If flashing this indicates a PCB fault |
Intergas Boiler Error Codes |
||
Fault Code | System Behaviour | |
10, 11, 12, 13, 14 | Sensor fault S1 | |
20, 21, 22, 23, 24 | Sensor fault S2 | |
0 | Low system pressure | |
0 | Sensor fault after self check | |
1 | Temperature too high | |
2 | S1 and S2 interchanged | |
4 | No flame signal | |
5 | Poor flame signal | |
6 | Flame detection fault | |
8 | Incorrect fan speed | |
27 | Shortcut outside sensor temperature | |
29, 30 | Gas valve relay faulty | |
Intergas Xtreme and Xclusive Boiler Error Codes | ||
Fault Code | System Behaviour | Possible solution / cause |
F000 | Sensor defect | Heat exchanger sensor needs replacing. |
F001 | Temperature too high during central heating demand |
Air could be in system, central heating system needs bleeding. There could be an error with the pump & it could need replacing. |
F002 | Temperature too high during domestic hot water (DHW) demand |
The wiring of DHW sensor needs checking, possible breakage. |
F003 | Flue gas temperature too high | Heat exchanger needs checking for contamination. |
F004 | No flame during startup | Gas valve is closed. Condensation drain is blocked and ignition needs checking. |
F005 | Flame disappears during operation | Condensation drain could be blocked, the air supply duct and flue needs checking for possible recirculation or blockage of flue gases. |
F006 | Flame simulation error | Gas valve could need replacing or burner controller could need replacing. |
F007 | No or insufficient ionisation flow | Wiring of ionisation/ignition pin could have a breakage shut down and could need replacing. |
F008 | Fan speed incorrect | Fan cable needs checking, fan or burner controller could need replacing. |
F009 | Burner controller has internal fault | Burner controller needs replacing. |
F010, F011 | Sensor fault | Possible issue with heat exchanger sensor, breakage or not connected properly. |
F012 | Sensor 5 fault | Wiring for flue gas sensor needs checking, possible breakage. |
F014 | Mounting fault sensor | Heat exchanger sensor is not mounted correctly and needs to be mounted properly. |
F015 | Mounting fault sensor S1 | Central heating flow sensor is not mounted correctly and needs mounting properly. |
Fault Image | System Behaviour |
---|---|
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Ignition lockout |
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High limit error |
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No tacho from fan |
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High flue gas temperature |
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Flame circuit error |
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Valve drive circuit error |
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Dual sensor error |
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Default lockout |
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Remote reset lockout |
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ADC error |
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CRC error – SW switch |
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Flame signal lost 5 times in 4 minutes. |
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Boiler flow temp sensor open circuit |
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Domestic hot water (DHW) sensor short |
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Domestic hot water (DHW) sensor open |
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Low mains voltage |
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Water pressure error |
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OpenTherm sensor shorted to earth |
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Water pressure too high |
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No water pressure signal received from MMI |
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Boiler return temp. sensor open circuit |
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Flue gas temperature sensor short |
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Flue gas temperature sensor open circuit |
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Communication MMI – CVBC lost |
|
Johnson & Starley Boiler Error Codes
Fault Code / Fault Image | System Behaviour |
---|---|
1 | Flame lockout after several ignition attempts |
2 | False flame |
3 | High water temperature limit |
5 | No tacho from fan |
8 | Flame circuit error |
9 | Valve driver circuit error |
11 | Flow/return sensor calibration error |
12 | Default lockout |
13 | Elapsed the number of retrials |
21 | ADC error |
26 | Flame signal lost 5 times in 4 minutes |
31 | Centra heating supply sensor error (open or short) |
44 | Central heating return sensor error (open or short) |
7 | High flue gas temperature |
25 | CRC error |
30 | Boiler flow temperature sensor short circuit |
31 | Boiler flow temperature sensor open circuit |
32 | Domestic hot water temperature sensor short circuit |
33 | Domestic hot water temperature sensor open circuit |
34 | Low mains supply voltage |
37 | Low system water pressure |
40 | High system water pressure |
41 | No water pressure signal received from MMI |
45 | Flue gas temperature sensor short circuit |
46 | Flue gas temperature sensor open circuit |
47 | Water pressure sensor open circuit |
99 | Communication MMI -ESYS lost |
E01 | Ignition lockout |
E02 | False flame lockout |
E03 | Overheat lockout |
E05 | Fan fault |
E08 | Flame circuit failure |
E09 | Valve feed back error |
E12 | EEPROM lockout |
E15 | Sensor drift lockout |
E16, E17, E18 | Sensor stuck lockout |
E21 | ADC lockout |
E33 | Return thermistor fault |
E34 | Low power supply lockout |
E35 | Flow thermistor fault |
F07 | Exhaust sensor fault |
F13 | Remote reset lockout |
F37 | Low water pressure |
F40 | Water pressure too high |
F47 | Water pressure sensor not connected |
F52 | Domestic hot water (DHW) sensor fault |
F53 | Flue temperature sensor lockout |
C36 Combi Gas Boiler Error Codes |
|
Fault Code | Possible Cause |
E01 | Ignition failure – the boiler has attempted to light 5 times and not succeeded – check the gas supply is on |
E02 | False flame – possibly a problem with the power supply |
E03 | Boiler overheat – check that any valves to the heating circuit have not been shut down, no air in the system and that the water pressure is correct |
E05 | Fan failure – boiler cannot detect fan rotation – check fan operation and both connectors onto fan |
E07 | Flue overheat – check combustion and flue temperature vs. return temperature – the flue temperature should be no more than 10C above return temperature. Possible heat exchanger fault. |
E08 | Flame circuit error – possible control box fault |
E09 | Valve drive error – possible gas valve or control box fault |
E10 | Control box errors – possible faulty control box |
E11 | The automatic test for calibration of flow and return sensors has failed – check both flow and return sensors are located on the correct pipes and are producing the correct readings |
E12 to E22 | Control box errors – possible faulty control box |
E23 | Water filling error – check water pressure sensor |
E24 | Water pressure lost 4 times in 24 hours – possible leak, check system and boiler |
E25 | Control box errors – possible faulty control box |
E26 | Flame drop out – check for obstruction of the flue and/or air terminals, blockage/freezing of the drain pipe or a low gas supply (LPG). |
E30 | Flow sensor short circuit – check connections to flow sensor |
E31 | Flow sensor open circuit – check connections to flow sensor are in place |
E32 | DHW sensor short circuit – check connections to domestic hot water (DHW) sensor |
E33 | Domestic hot water (DHW) sensor short circuit – check connections to DHW sensor are in place |
E34 | Mains supply voltage < 180V – may be a problem with your power supply |
E35 | Mains supply frequency incorrect – may be a problem with the power supply |
E37 | Water pressure error – increase the system water pressure |
E38 | Reset key fault – replace fascia PCB |
E40 | Water pressure too high |
E41 | Communication error between fascia and control box – check cables |
E43 | Return sensor short circuit – check connections to return sensor |
E44 | Return sensor open circuit – check connections to return sensor are in place |
E45 | Flue sensor short circuit – check connections to flue sensor |
E46 | Communication error between fascia and control box – check cables |
E99 | Flue sensor short circuit – check connections to flue sensor are in place |
S30 System Gas Boiler Error Codes |
|
Fault Code | Possible Cause |
0 | The boiler is in standby mode awaiting either a central heating call or hot water demand |
C | The boiler has a call for central heating / hot water but the appliance has reached the desired temperature set on the boiler |
C And Burner Light | The boiler is operating for central heating / hot water |
F And Burner Light | The boiler is operating in frost mode |
F0 | Boiler Chip Card (BCC) not fitted |
F6 | Outside sensor failure |
F7 | Low mains voltage |
F9 | Printed circuit board (PCB) Fault |
L5 | 5 boiler resets in 15 minutes |
L6 | False flame lockout |
C0 | Boiler Chip Card (BCC) activation fault |
C2 | Boiler Chip Card (BCC) fault |
F1 | Low water pressure |
L1 | Flow temperature overheat |
F2 | Flame loss |
L2 | Flame loss |
F3 | Fan fault |
F4 | Control / No flow thermistor |
F5 | Return thermistor |
C40 C55 Combi Gas Boiler |
|
Fault Code | Possible Cause |
Enn | Fault causing a boiler shutdown |
E00 | Flame detected when not expected – check boiler earth and probe condition |
E02 | No ignition after restart – check gas supply, gas valve operation and ignitor electrode spark generation |
E03 | Gas valve faulty or not connected |
E04 | Power has been reset whilst boiler was in lockout |
E11 | Internal electronics error – rest or replace control box |
E18 | Flow overheat – check water circulation |
E19 | Maximum return temperature exceeded – check circulation |
E25 | Flow temperature increased too quickly – check water circulation |
E30 | Difference between flow and return temperatures too high – check circulation. |
E31 | Flow thermistor short circuit – check/replace connections/thermistor |
E32 | Return thermistor short circuit – check/replace connections/thermistor |
E36 | Flow thermistor open circuit – check/replace connections/thermistor |
E37 | Return thermistor open circuit – check/replace connections/thermistor |
E44 | Low water pressure |
Main Boiler Error Codes | |
Fault Code | System Behaviour |
E168 | Error code E168 could mean that your boiler has detected a problem but can’t work out exactly what it is; |
E20 | Central Heating NTC Fault indicate faulty components. You should make a note of the displayed error code |
E28 | PCB Fault indicate faulty components |
E50 | Hot Water NTC Fault indicate faulty components |
E110 | Safety Thermostat operated – displayed when the primary water pressure is less than 0.5 bar. After repressurising the system the boiler should operate. Your installer will be able to advise you about the method of repressurising. |
E119 | Water pressure switch not operated – displayed when the primary water pressure is less than 0.5 bar. After repressurising the system the boiler should operate. Your installer will be able to advise you about the method of repressurising |
E33 | Interruption Of Gas Supply or Flame Failure indicates that the gas supply has been interrupted, ignition has failed or the flame has not been detected. Ensure that the gas supply has not been turned off, and turn the selector switch to the reset position and hold for at least 5 seconds. If the boiler does not relight, or the code is displayed regularly. |
E60 | Fan or fan wiring fault |
Main Error Code E133 | A Main boiler showing the error code E133 means that the condensate pipe has frozen. This is an issue that can happen during the cold winter months as the condensate pipe leads outside but luckily this is an issue that can be resolved fairly quickly without the need for an engineer. You just need to thaw out the condensate pipe, which you can find out how to do with our guide. |
Initial User Checks | |
You are able to make some checks before calling out a service engineer. | |
Check you have enough fuel: check the sight gauge. | |
Check the fuel supply valves are open. | |
Check the external fire valve hasn’t tripped: press the trip button. | |
Is the boiler electrical supply on? | |
Is the control panel high limit thermostat tripped? Check and reset if needed. | |
Burner control box locked out: check and press the lens. | |
Mistral Boiler Error Codes | |
Fault | Possible Cause |
Burner does not start | Air locks, supply lines blocked or tank vent blocked (no fuel getting into tank) |
Restriction suspected / fuel supply fault | Power supply to the boiler failed, burner control box locked out, burner motor fault or pump seized |
Burner fault locks out after 15 seconds | Photocell fault, restricted oil supply, combustion setting out of specification |
No flame established (burner fault) | Ignition failure, oil restricted or nozzle locked |
Burner fault runs but continually pulsates | Condensate trap blocked or flue system blocked |
Lock-out | Losing oil in the supply suction line or oil level in tank below minimum level |
Burner running but smokes | Tank topped with wrong fuel/ Air supply restricted/ Dust build up |
Burner flame shuts down slowly | Balanced flue system leaking/ Combustion leaks/ Suction line drawing air into fuel |
Burner fails to reach working temperature | Burner output restricted/ Low efficiency/ Control thermostat fault |
Oil smells | Oil leakage at connection |
No hot water | Circulating pump seized/ Programmer channel off |
Flow and water temperature low | Programmer for central heating or domestic hot water are off, debris build-up or low water supply pressure |
No central heating or hot water | Programmer channels are off, thermostat fault or turned off |
Thermostat trips off | Fault circulating pump |
No central heating | Spring fault or return valve not moving or operating properly – room stat error |
No domestic hot water | Spring fault, jammed in how water mode, flow switch blocked or faulty |
Discharges on pressure relief valve | Pressure vessel has lost charge, insufficient expansion volume |
Promax Combi, System, and Store Error Codes | |
Fault Code | Possible Cause |
E10 | Outdoor sensor error |
E20 | Central heating thermistor sensor fault |
E28 | Flue thermistor fault |
E50 | Domestic hot water sensor fault |
E110 | Boiler overheat tripped |
E119 | System pressure too low |
E125 | Primary water circulation fault |
E130 | Flue thermostat sensor tripped (lockout) |
E131 | Flue overheat lockout |
E133 | Ignition fault |
E151 | Printed circuit board (PCB) error |
E152 | PCB error |
E160 | Fan fault |
E161 | Fan fault |
E164 | Domestic hot water sensor error – could be a heating flow switch error) |
E167 | Printed circuit board (PCB) fault |
E168 | Printed circuit board (PCB) lockout |
E193 | Circulation |
Potterton Promax Ultra, Gold/Titanium Combi & System Boiler Error Codes |
|
Fault Code | Possible Cause |
E10 | Outdoor sensor error |
E09 | Gas valve wiring fault |
E10 | Outdoor sensor error |
E15 | Gas valve connection fault |
E20 | Central heating thermistor sensor fault |
E28 | Flue thermistor fault |
E40 | Central heating return thermistor fault |
E50 | Domestic hot water sensor fault |
E53 | Flue obstruction |
E55 | Calibration required |
E78 | Water pressure sensor fault |
E83 / 84 / 85 / 86 / 87 | No communication between room controller and boiler |
E92 | Combustion test alarm during auto-setting |
E109 | Poor circulation |
E110 | Boiler overheat tripped |
E117 | System pressure too high (>2.9 bar) |
E118 | System pressure too low |
E125 | Primary water circulation fault |
E128 | Loss of flame during operation |
E129 | Loss of flame during calibration |
E130 | Flue thermostat sensor tripped (lockout) |
E133 | Ignition fault |
E135 | Internal error |
E154 | Primary flow fault |
E160 | Fan fault |
E270 | Dry fire |
E317 | Wrong power supply (HZ) |
E321 | Hot water thermistor fault |
E384 | Flame detected when gas valve off (false flame) |
E385 | Low voltage (less than 195v) |
Potterton Assure Combi Boiler Error Codes |
|
Fault Code | Possible Cause |
E09 | Gas valve connection cable fault |
E10 | External probe fault |
E12 | Differential water flow switch is still open |
E13 | Differential water flow switch is still closed |
E15 | fault with the gas valve command |
E20 | Central heating NTC fault |
E28 | Flue NTC fault |
E40 | Central heating return NTC fault |
E50 | Domestic hot water (DHW) Negative Temperature Coefficient (NTC) sensor (tank boiler) (s.c) or DHW NTC sensor (tank boiler) (o.c.) fault |
E83 / E84 / E85 / E86 / E87 | Communication error |
E109 | Pre-circulation fault |
E110 | Boiler max temperature exceeded for gradient (or over temperature) – Probably a jammed pump, air in the circuit or safety thermostat sensor tripped |
E118 | Primary system water pressure too low |
E125 | Primary circulation fault |
E128 | Flame failure (12 times) |
E129 | Frequent loss of flame (safety error ) |
E130 | Flue thermostat sensor tripped and locked out |
E133 | Possible gas supply issue (failure to light). |
E134 | Elapsed time gas valve open without gas |
E135 | Internal error (interruption of gas supply) |
E154 | Flow/return sensor temperature test |
E160 | Problem with fan (possible wiring fault) |
E163 | Domestic hot water (DHW) Negative thermistor coefficient (NTC) sensor (s.c.) or (o.c.) fault |
E270 | Dry fire |
E317 | Wrong power supply (HZ) |
E321 | Hot water fault |
E384 | False flame |
E385 | Under voltage |
E430 | Water pressure test |
E430 + Flame crossed | Water pressure test failed |
Ravenheat Boiler Error Codes |
|
Fault Code | System Behaviour |
F73 | Heating circuit pressure sensor fault |
F74 | Heating circuit pressure sensor fault |
F76 | Thermal fuse fault |
F77 | Fault in gas valve motor |
F83 | No water in the installation – the temperature does not increase when the burner is lit |
F84 | Permanent temperature difference betweenF flow and return heating sensors |
F85 | Flow and return heating sensors fault |
F86 | Underfloor heating contact fault |
ERR | User interface fault |
4 | Domestic hot water (DHW) sensor faulty |
Ravenheat CSI 120 Boiler Error Codes |
|
Fault Code | System Behaviour |
17 | Possible issue with fan voltage |
1 | Boiler failed to ignite – problem with gas valve operation, fan failing to start, ignition control board and cables |
28 | Failed low water – pressure switch or pump, possible issue with pump, incorrect system pressure or the low water switch pressure needs replacing |
12 | Failed heating sensor – issue with heating sensor and could need replacing |
4 | Failed overheat – the overheat thermostat needs checking |
30 | Failed flue temperature – check operating system |
31 | Failed flue temperature – the flue sensor needs checking or replacing |
2 | Failed temperature – try resetting the boiler |
Ravenheat CS 80/90, WH System, WH 80/90 Boiler Error Codes |
|
Fault Code | System Behaviour |
E02 | Problem with the pump circulation |
E03 | Flow sensor damaged |
E04 | Domestic hot water (DHW) sensor damaged |
E05 | Problem with fan – possibly no signal |
E06 | Central heating (CH) sensor is overheating |
E08 | Low water pressure |
E09 | Overheat sensor overheating |
E10 | High water pressure |
E13 | Software error |
E21 | Central heating (CH) return sensor overheating |
E22 | Flue sensor overheating |
E23 | Flue sensor damaged |
E24 | Central heating return sensor error – possibly damaged |
E25 | Main heat exchanger frozen |
E29 | Domestic hot water (DHW) sensor overheating error |
E31 | OpenTherm communication error |
E41 | Different flow/return temperatures |
E42 | Different temperature error |
E43 | Different temperature error |
E44 | Different temperature error |
E46 | Water pressure sensor error – could be open or short |
Ravenheat HE 80/90 HE 25-30s, HE 80-98s, HE 8-98s or HE 25-30s compact |
|
Different temperature error | |
Fault Code | System Behaviour |
02E | Problem with the pump circulation |
03E | Flow sensor damaged |
04E | Domestic hot water (DHW) sensor damaged |
05E | Problem with fan, possibly no signal |
06E | Central heating sensor is overheating |
08E | Low water pressure |
09E | Overheat sensor overheating |
10E | High water pressure error |
13E | Software error |
21E | Central heating return sensor overheating |
22E | Flue sensor overheating |
23E | Flue sensor damaged |
24E | Central heating return sensor error, possibly damaged |
25E | Main heat exchanger frozen |
29E | D.H/W sensor overheating error |
31E | OpenTherm (OT) communication error |
41E | Different temperature between flow and return |
42E | Different temperature error |
43E | |
44E | Different temperature error |
46E | Water pressure sensor error, could be open or short |
Vitodens 200 Boiler Error Codes |
||
Fault Code | System Behaviour | Cause of Problem |
2 | Burner control switches to lockout | Safety chain was activated |
04, 05, 06, 08 | Burner control switches to lockout | Fan speed too high/low at start |
07, 09 | Burner control switches to lockout | Basic level of air pressure threshold in standby mode not correct |
0A | Burner control switches to lockout | Fault with fan speed |
0D | Burner control switches to lockout | Reset button pressed repeatedly or while burner is running |
1A, 1B | Burner blocked | Flow sensor 1, 2 faulty |
1F | Burner blocked | Differential flow rate too large |
25 | Boiler operates with high boiler water temperature |
Emissions test switch turned to “hand symbol” for 30 minutes already |
26 | Boiler operates with continuous relay test | Setting mode for maximum or minimum rated input active for 30 minutes already |
35 | Boiler does not activate | Reset button (pressed while burner is OFF) with emissions test switch turned to “hand symbol” |
A2 | N/A | KM-BUS fault to Vitocom |
A5 | N/A | Short circuit / open circuit |
Fault Code 0B | ||
Boiler Model | System Behaviour | Cause of Problem |
Vitodens 200 | Burner control switches to lockout, fan doesn’t idle after auto reset (incorrect fan rpm). | Severe wind conditions in vent system |
Vitodens 100-W | Burner blocked | Insufficient water flow, incorrect flow direction or defective flow switch. |
Fault Code 0C | ||
Boiler Model |
System Behaviour |
Cause of Problem |
Vitodens 100-W | Burner blocked | Insufficient power supply |
Vitodens 200 | Burner control switches to lockout | Flame signal still present after switching off |
Fault Code 0F | ||
Boiler Model |
System Behaviour |
Cause of Problem |
Vitodens 222-F | Control mode | Displayed in the fault history |
Vitotronic 300 / Vitotronic 300-K, with Vitotronic 300 / Vitodens 200-W / Vitocontrol-S, with Vitotronic 100 |
Control mode / Controlled operation | Boiler service required |
Vitotronic 200 / 300 | Normal operation | Boiler service required |
Vitocontrol-S, MW1 with Vitotronic 100 / Vitotronic 300-K, MW1S with Vitotronic 100 |
Control mode | Maintenance |
Fault Code 10 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
Vitodens 200-W / 222-F / Vitotronic 300 / 200/ 200-H / 050/200-H / 300-K / vitocontrol-S |
Boiler operates based on outdoor temperature of 32°F / 0°C |
Short circuit – Outdoor temperature sensor |
Vitotronic 300-K, MW2S with Vitotronic 100 / Vitodens 100-W (combiPLUS) / 200-w / Vitocontrol-S, WB2B with Vitotronic 100 |
Controls as if the outdoor temperature / Constant Mode |
Outdoor temperature sensor shorted out |
Viessmann Fault Code 10, 14, F3, and F4 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
Vitodens 200 | Burner control switches to lockout | No flame signal is present |
Fault Code 18 and D1 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
Vitodens 100 / 200-W / 222-F / Vitotronic 300-K With 100 / Vitocontrol-S |
Boiler operates based on outdoor temperature of 32°F / 0°C / Constant Mode |
Outdoor temperature sensor cable broken |
Vitotronic / 100 / 200 / 300 / 050/200-H /300-K / Vitocontrol-S, MW1 with Vitotronic 100 |
Operates on basis of 32°F / 0°C outdoor temperature | Open circuit – Outdoor temperature sensor |
Vitotronic 200-H / Vitotronic 300-K, MW1B with Vitotronic 300 / Vitotronic 300-K, MW2B with Vitotronic 200 |
Controls as if the outdoor temperature | Lead break, Outdoor temperature sensor |
Vitotronic 050/200-H | Activates after 0°C / 32°F outdoor temperature | Cable break – Outdoor temperature sensor |
Vitodens 100-W | Burner in fault mode | DIP switch S2 is set to “ON” |
Fault Code 19 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
Vitotronic 300 | Activates after 0°C / 32°F outdoor temperature | Communication fault, Wireless Outdoor temperature sensor |
Fault Code 20 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
Vitocontrol-S with Vitotronic 100 / Vitotronic 300 / 300-K / 200 / 100 |
Stand-alone control unit without supply temperature sensor (possibly supply temperature not high enough) |
short circuit – Common supply temperature sensor |
Vitocontrol-S with Vitotronic 100 / Vitotronic 300-K, with Vitotronic 200 |
Vitocontrol-S, controls in a stand-alone manner w/o supply temperature sensor (supply temperature may not be high enough) |
Common supply temperature sensor shorted out |
Vitocrossal 300 | Regulates without supply temperature sensor (low-loss header) |
Short circuit – System Flow temperature sensor |
Vitodens 200-W / 222-F | Regulates without supply temperature sensor (low-loss header) |
Short circuit – System supply temperature sensor |
Vitotronic 050/200-H< / 200 / 200-H / 300 | Mixing valve closes/ closed | Short circuit – Supply temperature sensor / mixing valve circuit M1 |
Vitotronic 300-K, with Vitotronic 100 | Vitotronic 300-K, MW1S controls in a stand-alone manner w/o strap-on sensor (supply temperature may not be high enough) |
Short circuit – Strap-on temperature sensor |
Vitodens 200-W | Regulates without supply temperature sensor (low-loss header) |
System supply temperature sensor shorted out |
Fault Code 21 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
Vitotronic 200 / 300 | operation without influence of return water temperature | Short circuit – Return water temperature sensor |
Viessmann Fault Code 28 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
Vitocontrol-S with Vitotronic 100 | Vitocontrol-S, VD2/CT3/CM2 controls in a stand-alone manner w/o supply temperature sensor (supply temperature may not be high enough) |
Open circuit – Common supply temperature sensor |
Vitocontrol-S with Vitotronic 100 / Vitotronic 300-K,with Vitotronic 100 |
Vitocontrol-S, WB2B controls in a stand-alone manner w/o supply temperature sensor (supply temperature may not be high enough) |
Common supply temperature sensor cable broken |
Vitocrossal 300 / Vitodens 200-W / 22-F | Regulates without supply temperature sensor (low-loss header) |
System supply temperature sensor cable broken |
Vitotronic 050/200-H | Mixing valve closes | Cable break – Supply temperature sensor |
Vitotronic 050/200-H | Mixing valve is closed | Open circuit – Supply temperature sensor of mixing valve circuit M1 |
Vitotronic 200-H / Vitotronic 200 / 300 | Mixing valve is being closed | Lead break, Supply temperature sensor, heating circuit with mixing valve M1 (heating circuit 1) |
Vitotronic 300 Vitotronic / 300-K with Vitotronic 300 / 200 | Stand-alone control unit without supply temperature sensor (possibly supply temperature not high enough) |
Lead break, Common supply temperature sensor |
Vitotronic 300-K with Vitotronic 100 | Vitotronic 300-K, MW1S controls in a stand-alone manner w/o strap-on sensor (supply temperature may not be high enough) |
Open circuit – Strap-on temperature sensor |
Fault Code 29, 41, 49, F80, F81, F83, F88 and F89 |
||
Fault Code 30 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
Vitotronic 200 / 300 | Normal operation without influence of return water temperature |
Open circuit 1 or 2 – Return water temperature sensor (of mixing valve circuit 1) |
Boiler Model |
System Behaviour |
Cause of Problem |
Vitocontrol-S, with Vitotronic 100 / Vitocrossal 300 / Vitodens 200-W / 222-F / Vitotronic 100 / 200 / 300 |
Burner is started and stopped via an adjustable high limit | Short circuit – Boiler water temperature sensor |
Vitocontrol-S with Vitotronic 100 / Vitodens 100-W (CombiPLUS)/ 200-1 |
Burner blocked | Boiler water temperature sensor shorted out |
Fault Code 38 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
Vitodens – 200-W, 222-F and COMBIPLUS | Burner blocked | Boiler water temperature sensor cable broken |
– Vitotronic 100, 200 and 300 – Vitocontrol-S with Vitotronic 100 |
Burner is switched on and off by the adjustable high limit | Open circuit – Boiler temperature sensor |
Vitotronic 300-K with Vitotronic 300 / Vitotronic 300-K with Vitotronic 300 |
The burner is started and stopped via a temperature controller |
Lead break, Boiler water temperature sensor |
Vitodens 100-W | Burner blocked | Boiler water temperature sensor lead broken |
Fault Code 40 And 44 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
All Viessmann boilers | Mixing valve closes | Heating circuit 2 with mixing valve supply short circuit on temperature sensor |
Fault Code 41 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
Vitotronic 300 | Operation without accounting for return water temperature | Short circuit – Return water temperature sensor of mixing valve circuit 2 |
Fault Code 48 and 4C | ||
Boiler Model |
System Behaviour |
Cause of Problem |
All Viessmann boilers | Mixing valve closes / Closed | Heating circuit 2 with mixing valve supply temperature sensor cable broken / open circuit |
Fault Code 50, 51, 58 and 59 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
Vitodens 200-W and 222-F | No domestic hot water (DHW) – fault with DHW | Short circuit/open circuit, DHW tank temperature sensor or lead break |
Fault Code 52 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
Vitotronic 300 | Control mode | Short circuit – supply temperature sensor low-loss header |
Vitodens 100-W CombiPLUS | Burner blocked (with CombiPLUS only) | Flow sensor shorted out (in CombiPLUS) |
Fault Code 55, 56 and 57 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
Vitotronic 300-K with Vitotronic 200 | Control mode | Maintenance or error on Vitotronic 100 of boiler 5-8 |
Fault Code 5A, B7, and B8 |
||
Boiler Model |
System Behaviour |
Cause of Problem |
All Viessmann boilers | Control mode | Lead break, low-loss header Supply temperature sensor |
All Viessmann boilers | Burner blocked / control mode | sensor cable broken |
Fault Code 5C, 5D, 5E and 5F | ||
Boiler Model |
System Behaviour |
Cause of Problem |
Vitotronic 300-K with Vitotronic 200 | Control mode | Communication fault, Vitotronic 100 of boiler 5-8 |
Fault Code 60, 68, 70, 78, BD, BE and BF | ||
Boiler Model |
System Behaviour |
Cause of Problem |
All Viessmann boilers | – No output reduction – Return control Open – Boiler with maximum temperature |
Short/open circuit – Temperature sensor [17A] |
Fault Code 80, 81, 82, 83 and FD | ||
Boiler Model |
System Behaviour |
Cause of Problem |
All Viessmann boilers | Burner control unit in a fault state; system cools down; burner control unit locked out |
Short circuit – Boiler water temperature sensor, burner control unit |
Fault Code 88, 89, and E6 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
Vitotronic 300 | Burner control unit in a fault state | Lead break, Boiler water temperature sensor, burner control unit |
| ||
Fault Code 8C, 8D, 8E and 8F | ||
Boiler Model |
System Behaviour |
Cause of Problem |
Vitocontrol-S with Vitotronic 100 – Vitotronic 300-K with Vitotronic 100 / 200 |
Control mode | Communication fault, Vitotronic 100 of boiler 1-4 |
Fault Code 90, 91, 92, 93, 94, 98, 99, 9A, 9B , 9C, 9E, 9F and AB | ||
Boiler Model |
System Behaviour |
Cause of Problem |
All Viessmann boilers | Control mode | Short circuit – Temperature sensor [5] / [6] / [7] / [10] |
Fault Code A0, A1, A2, AA, and AC | ||
Boiler Model |
System Behaviour |
Cause of Problem |
Vitotronic 300 – Vitotronic 300-K with Vitotronic 300 |
Boiler cools down | Fault, safety equipment at “X2 / X3 / X7” of plug-in adaptor 2 for external safety equipment |
Vitodens 200 | – Boiler operates in emergency mode (after approx. 30 min) BUS fault – Boiler cools down |
-Internal BUS fault – Open circuit – Internal BUS connection |
Fault Code A3, B0, F1, FE1 and FE2 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
All Viessmann boilers | Burner blocked | Flue gas temperature sensor not properly positioned – check Sensor |
Fault Code A4 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
Vitodens 200 | Pump runs at maximum speed | Open circuit – BUS connection with variable speed heating circuit pump |
Fault Code A7 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
Vitocrossal 300 – Vitodens 200-W, 222-F, 300 |
Control mode (stays in factory default setting) | Faulty Programming unit |
Fault Code A8 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
Vitodens 222-F | Burner blocked. The venting program is started automatically |
Air lock in the Internal circulation pump or minimum flow rate not achieved |
Fault Code A9, BA, BB, BC and FE0 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
All Viessmann boilers | Control Mode | Communication error |
Fault Code AD | ||
Boiler Model |
System Behaviour |
Cause of Problem |
Vitocontrol-S with Vitotronic 100 -Vitotronic 100 -Vitotronic 300-K with Vitotronic 300 |
Control mode | Isolation valve configuration error: Coding OC:2, OC:3 or OC:4 set, and coding 4E:1 not set |
Fault Code B1 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
All Viessmann boilers | Control mode | Communication error – programming unit |
Fault Code B2 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
Vitodens 200 | Boiler cools down | Sensor inputs are not read correctly |
Fault Code B3 and E5 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
Vitodens 200 | Setting via service level not possible | Data points are not stored – internal fault VR20 |
Fault Code B4 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
Vitocontrol-S with Vitotronic 100 – Vitotronic 100, 200 and 300 – Vitotronic 300-K with Vitotronic 100 |
Emissions test mode | Internal electronics fault |
Vitocontrol-S with Vitotronic 100 / Vitodens 200-W | Regulates as if the outside temperature was 32°F (0°C) | Internal fault |
Vitotronic 050/200-H | Undefined control characteristics | Internal electronics fault |
Fault Code B5 |
||
System Behaviour |
Cause of Problem | |
All Viessmann boilers | Control mode | Internal electronics fault |
Fault Code B6 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
All Viessmann boilers | Constant mode | Invalid hardware recognised |
Fault Code B9, ED, F0, FE5, FEC, FED, FEE, FEF, FFD and FFF | ||
Boiler Model |
System Behaviour |
Cause of Problem |
All Viessmann boilers | Normal operation / fault around burner control unit | Internal fault |
Fault Code C1 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
All Viessmann boilers | Control Mode | External safety equipment |
Fault Code C2-C8, CD-CF, D2-D8, DA-DF, and E0 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
All Viessmann boilers | Control mode | Open circuit – KM BUS to solar control unit / Extension AM1 / DE1-DE3 M1 / communication fault |
Fault Code C9, CA and CB | ||
Boiler Model |
System Behaviour |
Cause of Problem |
Vitocontrol-S with Vitotronic 100 / Vitotronic 100 / 300 / Vitotronic 300-K with Vitotronic 300 |
Boiler cools down | Error: Maximum pressure limiter 1 2 |
Fault Code CC and F0 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
Vitodens 200 | Burner control unit switches to lockout (due to large line voltage fluctuations) |
Differential air pressure sensor / open circuit |
Fault Code D4 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
All Viessmann boilers | Boiler cools down | Fixed high limit has responded or fuse F2 has blown. |
Fault Code D5 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
All Viessmann boilers | Boiler drives up to electronic maximum limit | Boiler does not log in at the cascade control unit |
Fault Code E1, E7, E8, E9, EA, EB, EC and FF2 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
All Viessmann boilers | Burner in fault mode | Ionization current too high during calibration |
Fault Code E2 and E3 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
Vitodens 200-W / 222-F / Vitotronic 300 | Burner in fault mode | Heating water flow rate too low during calibration; flow switch caused shutdown |
Fault Code E4 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
All Viessmann boilers | Burner blocked | Fault, supply voltage 24V |
Fault Code EE and EF | ||
Boiler Model |
System Behaviour |
Cause of Problem |
Vitocontrol-S with Vitotronic 100 / Vitocrossal 300 / Vitodens 200-W / 222-F / Vitotronic 300 |
Burner in fault mode | At burner start, flame signal is missing or too weak |
Fault Code F5 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
Vitodens 100-W / 200 / 300 / Vitotronic 300 | Burner blocked | Faulty Air pressure switch |
Fault Code F6, 58, F9, FE1, FE2 and FF6 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
All Viessmann boilers | Gas pressure switch shows no gas pressure / Electrical connection fault |
Gas shut-off valve closed; gas pressure switch faulty; multiple problems with gas supply |
Fault Code FA and FB | ||
Boiler Model |
System Behaviour |
Cause of Problem |
All Viessmann boilers | Burner in fault mode / Emergency operation | Fan not at standstill / plug-in connection |
Fault Code FB7, FF4, FF2, FF7, FF8 and FF9 |
||
Boiler Model |
System Behaviour |
Cause of Problem |
Vitocrossal 200 | Case A: Burner control unit in a fault state; system cools down; burner control unit locked out. Case B: Type of coding card |
Case A: Coding card not inserted in the burner control unit; incorrect or faulty coding card. Case B: Coding card does not match burner control unit. |
Fault Code FC | ||
Boiler Model |
System Behaviour |
Cause of Problem |
All Viessmann boilers | Burner in fault mode | Gas valve faulty, issue with modulation valve control or vent system blocked |
Fault Code FE | ||
Boiler Model |
System Behaviour |
Cause of Problem |
All Viessmann boilers | Burner blocked or in fault mode | Strong interference (EMC) field nearby, or faulty main printed circuit board (PCB) |
Fault Code FE4 | ||
Boiler Model |
System Behaviour |
Cause of Problem |
Vitocrossal 200 | Burner shuts down | Multiple detection of undervoltage |
Fault Code FFA, FFB and FR | ||
Boiler Model |
System Behaviour |
Cause of Problem |
Vitocrossal 200 / 400-620 / 186-311 | Fan runs without demand; burner control unit in a fault state |
Fan has not stopped, cable [100A] faulty, fan faulty, burner control unit faulty |
Viessmann Error Code F4 EE | ||
Viessmann error code F4 EE means that the condensate pipe has frozen and needs to be thawed. You can thaw out the pipe yourself fairly quickly and easily without the need for an engineer (if you feel confident enough), find out how with our guide to thawing out a frozen condensate pipe. |
Fault Code | Fault Image | System Behaviour |
---|---|---|
_St | N/A | Autostop |
_CL | N/A | Call for service |
A01 | ![]() |
Ignition failure flame not sensed – internal fault |
A02 | ![]() |
Limit thermostat fault |
A03 | ![]() |
Fan fault |
A04 | ![]() |
Insufficient system water pressure |
A06 | ![]() |
Domestic how water (DHW) thermistor fault |
A07 | ![]() |
Primary flow thermistor fault – temperature of water is too high. |
A08 | ![]() |
Return thermistor fault – water temperature too high. |
A09 | ![]() |
Flue thermistor or flue thermistor counter fault. |
A11 | ![]() |
False flame |
A77 | ![]() |
Low temperature thermostat fault |
ADJ | N/A | Calibration |
ACO | ![]() |
Service operation |
N/A | ![]() |
Flame on |
Fault Code | System Behaviour |
---|---|
P | Preheating function active |
P Blinking | Preheating function running |
Hours | Stand-by |
— | Off |
01 | Failure to ignite |
02 | Overheat |
03 | Problem with fan/flue |
04 | Insufficient water pressure |
05 | Reset as described for code 01 |
06 | Hot water thermistor open circuit |
07 | Primary thermistor open circuit |
Vokera Mynute Boiler Error Codes
Fault Code | System Behaviour |
---|---|
AL10, AL20, AL21, AL26, AL28, AL34 | Try resetting the boiler, if the fault reoccurs you need to contact a heating engineer. |
AL40 | Check the system’s pressure and refill if necessary. Reset the boiler, if the fault reoccurs then you need to contact a heating engineer. |
AL41 | Check system pressure – refill if necessary. If fault reoccurs, contact a heating engineer. |
AL52, AL55, AL60, AL71,AL73, AL74, AL79 | Contact a heating engineer. |
AL74, AL79 | Reset the boiler. If the fault reoccurs, contact a heating engineer. |
Evolve Combi Evolve System Error Codes
Fault Code | System Behaviour |
---|---|
E10 | Flame lockout |
E011 | Extraneous flame |
E020 | Limit thermostat |
E030 | Fan fault |
E040 | Water transducer – check system water pressure |
E041 | Water transducer – check system water pressure |
E042 | Water transducer fault |
E060 | Domestic hot water probe fault |
4070 | Fault flow sensor over temperature – flow sensor flow/return line probe differential alarm |
E077 | Main zone water thermostat |
E080 | Error with return line probe – over temperature outlet or differential alarm |
E090 | Flue gases over temperature probe |
E091 | Clean primary heat exchanger |
— | Water pressure low |
— | Water pressure high |
— | Boiler board communication lost |
— | BUS 485 communication lost |
E021, E022, E023, E024, E067. E088, E097 | Iono alarm |
E085, E094, E095 | Combustion fault/high CO |
E058 | Main voltage error |
E065 | Current modulation alarm |
E086 | Obstruction fumes alarm |
If any of the above error codes keep appearing on your Vokera boiler, contact a professional heating engineer to find the fault and repair your boiler.
Vokera Boiler Red Light On
Vokera boilers without a digital display won’t have an error code to let you know what’s wrong with the boiler, however, they do have red and green lights that will either remain on constantly or begin flashing depending on the situation. Read our guide to the Vokera boiler red light on Boiler Guide to get your boiler back up and running.
Warmflow Boiler Error Codes |
|
Fault Code | System Behaviour |
E01 | No flame – flame has failed during startup. |
E02 | Safety thermostat tripped (95°C) |
E03 | Flue thermo-fuse tripped |
H20 | Low system pressure |
E05 | Heating sensor fault |
E22 | Fan fault |
E16 | Parameter programming request |
E35 | Ionisation electrode fault |
E42 | Fan printed circuit board (PCB) fault |
Enerwa and Priwa Error Codes |
|
Fault Code | Possible Cause |
rE 02 | Low water pressure in heating system – parameter is adjusted wrong |
E 03 | High water pressure due to excessive water pressure or safety valve error |
E 04 | Domestic hot water (DHW) temperature sensor failure – possible error with electronic card or the NTC sensor. |
E 05 | Temperature sensor from radiator error – electronic card detecting a failure. |
E 13 | Exhaust gas temperature sensor error – excessive temperature alarm. |
E 14 | Exhaust gas temperature sensor error – electronic card detecting an anomaly in the gas exhaust gas sensor. |
E 15 | Fan error – a fan being blocked or excessive external air pressure. |
rE 06 / rE 08 | No ignition – control gas supply line valves could be open |
rE 07 | Safety thermostat intervention from dual sensor – excessive heating occurring due to any failure during normal operation, try resetting the boiler. |
E 10 | AUX output sensor error |
E 16 | AUX return sensor failure |
E 11 | Gas valve modulator connection is broken – could be due to an internal failure. |
E 17 / E 19 | Maximum difference failure between 2 NTC temperature sensor – poor circulation. |
rE 28 | Maximum locking number reached – boiler has reached the maximum reset number (5 times in an hour) – attempt 1 reset each hour thereafter. |
E 37 | Low voltage error – voltage required for operation is too low. |
E 40 | Electricity network frequency error – fluctuation in electricity frequency. |
rE 41 | Flame loss after 6 successive ignitions – gas supply line valve being open. |
E 42 | Error with pushbutton |
E 43 | Room thermostat communication error – disconnection or communication loss in room thermostat. |
rE 44 | Gas valve error due to opening period without flame – try resetting the boiler. |
E 62 | Calibration request – boiler has detected an absence of calibration control. |
rE 72 | Delta T error – boiler failing to ignite. Could be due to a gas line valve being closed or a flue error. |
E 74 | Temperature sensor error. |
E 77 | Current values reached – check combustion values and CO2 calibration, try resetting the boiler if this fails. Either the board or the valve will need replacing. |
E 78 | Regulation current value has been reached. Try resetting the boiler, check the gas pressure and check the combustion values and CO2 calibration – if this doesn’t work the board or valve needs replacing. |
E 79 | Minimum regulation current reached – try resetting the boiler – checking the gas pressure and checking the combustion values and CO2 calibration – the board or valve might need replacing. |
rE 80 | Gas valve driver error – due to an internal failure. |
rE 81 | Ignition problem at the first start – this could be due the flue line, possible flue blockage or chimney gasket. |
rE 82 | Burning problem – due to the flue line either being blocked or chimney gasket. |
E 83 | Temporary mis-burning error – could be due to a gas pressure or flue line issue. |
E 84 | Capacity reduction for detected low gas inlet pressure – check the CO2 calibration values. |
rE 88 | Error in gas line cycle – possible gas valve component error. |
E 89 | Problem on combustion feedback signal – gas pressure needs checking. |
E 90 | Error in regulating combustion – possible error with the calibration values chimney gas valve and board. |
E 92 | Air compensation active – the CO2 values need checking, possible error with the wind presence. |
E 93 | Unable to regulate combustion – possible calibration value issue, chimney gas valve or board. |
E 94 | Low gas pressure or exhaust recirculation that could be an issue with gas pressure. |
E 95 | Intermittent combustion value caused by a possible error with electrode position or electrical connection stability. |
E 96 | Flue blockage – due to chimney and combustion values – the boiler may need a calibration. |
rE 80 | Gas valve error – possible internal error. |
rE 81 | Ignition problem at the first start – could be due to a problem with a flue line. |
rE 82 | Burning problem error – flue line error. |
E 83 | Temporary mis-burning error that may be caused by the gas pressure or flue line. |
rE 88 | Gas line cycle error – could be due to a gas valve component error. |
rE 98 | Electronic card start error. |
rE 99 | An error has been detected in the Combi, try resetting the boiler. |