BoilerFaultCodes 306 Emergency
Boiler Fault Code 306
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 306 appears across 2 boiler brands and 11 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 27 April 2026