BoilerFaultCodes F53 High
Boiler Fault Code F53
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F53 appears across 1 boiler brand and 6 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 detected that the exhaust gases are getting too hot, which is a safety precaution to prevent damage. (As reported on Johnson Starley Comet 80)
Pick your boiler brand for the F53 fix
Source
Information for the F53 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