Boiler Fault Code Flame ON

Also written as FLAMEON — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026

Fault code Flame ON appears across 1 boiler brand and 6 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler's electronic control system is incorrectly detecting a flame inside the unit even when it should be turned off, which is a safety concern that prevents it from starting up correctly. (As reported on Vokera Easi-Heat Plus)