BoilerFaultCodes Fb 365 Emergency
Boiler Fault Code Fb 365
Also written as FB365 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Fb 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 potential issue with its internal gas control mechanism and has safely shut itself down to prevent any risk. (As reported on Worcester Bosch Greenstar 12i System)
Pick your boiler brand for the Fb 365 fix
Source
Information for the Fb 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