BoilerFaultCodes AL 41 High
Boiler Fault Code AL 41
Also written as AL41 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code AL 41 appears across 1 boiler brand and 14 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 stay lit after six attempts and has shut down to prevent damage, possibly due to a fuel supply issue or a faulty internal sensor. (As reported on Sime Brava One HE)
Pick your boiler brand for the AL 41 fix
Source
Information for the AL 41 fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026