BoilerFaultCodes AL79 High
Boiler Fault Code AL79
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code AL79 appears across 2 boiler brands 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 shut down because it is getting too hot too quickly, usually because the water isn't moving through the system properly. (As reported on Vokera Mynute Vhe)
Pick your boiler brand for the AL79 fix
Source
Information for the AL79 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