BoilerFaultCodes 364 Emergency
Boiler Fault Code 364
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 364 appears across 1 boiler brand and 6 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 an internal valve responsible for controlling gas flow is not closing correctly, meaning it is unsafe to continue operating. (As reported on Worcester Bosch 1000)
Pick your boiler brand for the 364 fix
Source
Information for the 364 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