Boiler Fault Code Fan Failure

Also written as FANFAILURE — same fault.

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

Fault code Fan Failure appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has detected that the internal mechanism responsible for safely venting exhaust gases is not operating correctly, so it has shut down to prevent any unsafe buildup of fumes. (As reported on Potterton Performa 24)