BoilerFaultCodes F36 High
Boiler Fault Code F36
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F36 appears across 1 boiler brand and 4 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler’s internal computer has detected a fault within its own circuitry, meaning it can no longer communicate with the boiler's components correctly. (As reported on Ferroli Optimax)
Pick your boiler brand for the F36 fix
Source
Information for the F36 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