BoilerFaultCodes 306 Emergency
Boiler Fault Code 306
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 306 appears across 1 boiler brand and 9 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is still detecting a flame even though it has tried to shut off the gas supply, which is a safety conflict. (As reported on Worcester Bosch Greenstar 8000 Life & Style)
Pick your boiler brand for the 306 fix
Source
Information for the 306 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