BoilerFaultCodes FA306 Emergency
Boiler Fault Code FA306
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code FA306 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 detects a flame signal even though it has commanded the burner to turn off, which may be due to a faulty sensor or a sticking gas valve. (As reported on Worcester Bosch GB162)
Pick your boiler brand for the FA306 fix
Source
Information for the FA306 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 27 April 2026