BoilerFaultCodes Flame detection fault High
Boiler Fault Code Flame detection fault
Also written as FLAMEDETECTIONFAULT — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Flame detection fault appears across 1 boiler brand and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is failing to light because the sensor that monitors the flame is either covered in soot or has stopped working correctly. (As reported on Worcester Bosch Utility)
Pick your boiler brand for the Flame detection fault fix
Source
Information for the Flame detection fault fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026