Boiler Fault Code ALL 41

Also written as ALL41 — same fault.

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

Fault code ALL 41 appears across 1 boiler brand 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 attempted to ignite several times but has failed to keep the flame running, so it has safely shut itself down to prevent gas from building up. (As reported on Sime Murelle Revolution 30)