Boiler Fault Code 364 FA

Also written as 364FA — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026

Fault code 364 FA appears across 1 boiler brand and 2 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 a safety valve responsible for controlling gas flow is not closing correctly, so it has safely shut itself down to prevent a potential gas leak. (As reported on Worcester Bosch Greenstar CDi Compact)