BoilerFaultCodes ALL 79 High
Boiler Fault Code ALL 79
Also written as ALL79 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code ALL 79 appears across 1 boiler brand and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler's gas valve is failing to draw the correct electrical current, which means the system cannot safely regulate the fuel supply to produce heat. (As reported on Sime Murelle Revolution 30)
Pick your boiler brand for the ALL 79 fix
Source
Information for the ALL 79 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