BoilerFaultCodes 306 V Emergency
Boiler Fault Code 306 V
Also written as 306V — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 306 V appears across 1 boiler brand and 10 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 after it has tried to shut off the gas, which is a safety conflict that requires a professional inspection. (As reported on Worcester Bosch Greenstar 8000 Life/Style)
Pick your boiler brand for the 306 V fix
Source
Information for the 306 V 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