Boiler Fault Code A 41

Also written as A41 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 31 August 2026

Fault code A 41 appears across 2 boiler brands and 5 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is struggling to clear exhaust gases because the internal fan is not operating correctly, which prevents the unit from firing up safely. (As reported on Chaffoteaux Minima HE System 24)