BoilerFaultCodes F.365 Emergency
Boiler Fault Code F.365
Also written as F365 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F.365 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 has detected a safety concern where the gas supply system is not switching off correctly, so it has shut down to prevent potential danger. (As reported on Viessmann Vitodens 222-F B2TF)
Pick your boiler brand for the F.365 fix
Source
Information for the F.365 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