Boiler Fault Code AL 44

Also written as AL44 — same fault.

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

Fault code AL 44 appears across 1 boiler brand and 7 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 and cannot detect a flame, which means your heating and hot water will not work until a faulty internal component is replaced. (As reported on Sime Dewy 30/130 HE FS)