Boiler Fault Code Fault

Also written as FAULT — same fault.

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

Fault code Fault appears across 2 boiler brands and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has failed to ignite or stay lit, which means it cannot produce heating or hot water, and requires a professional to check the fuel and exhaust systems for safety. (As reported on Vokera Vision S)