BoilerFaultCodes AL74 High
Boiler Fault Code AL74
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code AL74 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 is struggling to move water through your heating system, which means it has stopped heating your home to prevent itself from overheating. (As reported on Vokera Mynute Vhe)
Pick your boiler brand for the AL74 fix
Source
Information for the AL74 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