BoilerFaultCodes F65 High
Boiler Fault Code F65
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F65 appears across 3 boiler brands 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 that its internal computer has become dangerously hot and has shut itself down to prevent fire or electrical damage. (As reported on Heatline Capriz Plus)
Pick your boiler brand for the F65 fix
Source
Information for the F65 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