BoilerFaultCodes ALL 14 High
Boiler Fault Code ALL 14
Also written as ALL14 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code ALL 14 appears across 1 boiler brand and 9 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 issue with the sensor that monitors the temperature of the exhaust fumes, meaning it has shut down as a precaution to ensure safe operation. (As reported on Sime Murelle Revolution 30)
Pick your boiler brand for the ALL 14 fix
Source
Information for the ALL 14 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