BoilerFaultCodes AL74 High
Boiler Fault Code AL74
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code AL74 appears across 1 boiler brand and 6 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 electronic error or a communication failure that is preventing it from heating your home. (As reported on Vokera Mynute 28E / 35E)
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 27 April 2026