BoilerFaultCodes AL 07 High
Boiler Fault Code AL 07
Also written as AL07 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code AL 07 appears across 1 boiler brand and 22 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has switched itself off because it has detected that the internal water temperature is too high, often caused by trapped air or a blockage preventing water flow. (As reported on Sime Brava Slim HE System)
Pick your boiler brand for the AL 07 fix
Source
Information for the AL 07 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