BoilerFaultCodes AL26 High
Boiler Fault Code AL26
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code AL26 appears across 1 boiler brand and 8 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has sensed that the water returning to it is too hot, which suggests that the heat is not being effectively pumped away through your radiators. (As reported on Vokera Mynute 10E)
Pick your boiler brand for the AL26 fix
Source
Information for the AL26 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