BoilerFaultCodes AL 08 High
Boiler Fault Code AL 08
Also written as AL08 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code AL 08 appears across 1 boiler brand and 22 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is having trouble sensing the flame required to stay lit, which means it will stop working to ensure your safety. (As reported on Sime Murelle Pro HE System R)
Pick your boiler brand for the AL 08 fix
Source
Information for the AL 08 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