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 |
Bunner 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. |
F016 |
Mounting fault S3 |
Domestic hot water sensor is not mounted correctly and needs mounting properly. |
F018 |
Flue and / or air supply duct is blocked |
The flue and/or air supply duct could need cleaning. |
F019 |
BMM error |
Check the BMM wiring for breakages / BMM wiring could need replacing. |
F027 |
Short circuit of outdoor sensor |
Outdoor sensor could have a wiring issue, check and replace the outdoor sensor. |
F028 |
Reset error |
The reset button needs checking for unintentional operation e.g. cleaning of control panel. Burner controller might need replacing. |
F029 |
Gas valve error |
Gas valve needs checking for leakage / burner controller could need replacing |
FO30 |
Sensor S3 fault |
Check wiring of domestic hot water sensor for breakage or shutdown domestic hot water sensor – it could need replacing. |
F031 |
Sensor fault S1 |
Check wiring of central heating flow sensor for breakage and shutdown. Check that weather central heating flow sensor is connected correctly. |