Boiler Fault Code Flame detected after gas

Also written as FLAMEDETECTEDAFTERGAS — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026

Fault code Flame detected after gas appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler thinks it can still see a flame even though it has told the gas to turn off, which is causing it to shut down for safety. (As reported on Worcester Bosch Greenstar i)