BoilerFaultCodes AL 72 High
Boiler Fault Code AL 72
Also written as AL72 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code AL 72 appears across 1 boiler brand and 14 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 that a temperature sensor isn't correctly touching the pipe it needs to monitor, preventing it from reading the water temperature accurately. (As reported on Sime Murelle Pro HE Combi)
Pick your boiler brand for the AL 72 fix
Source
Information for the AL 72 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