BoilerFaultCodes AL 06 High
Boiler Fault Code AL 06
Also written as AL06 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code AL 06 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 has stopped working because it failed to light the flame properly, likely due to an issue with the gas supply, the ignition process, or the exhaust system. (As reported on Sime iQE Comfort 30)
Pick your boiler brand for the AL 06 fix
Source
Information for the AL 06 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