BoilerFaultCodes AL 80 High
Boiler Fault Code AL 80
Also written as AL80 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code AL 80 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 detected an internal communication failure between the control board and the gas valve, meaning the system cannot safely manage the flow of gas to start the burner. (As reported on Sime Giulia Combi 30)
Pick your boiler brand for the AL 80 fix
Source
Information for the AL 80 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