BoilerFaultCodes 363 High
Boiler Fault Code 363
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 363 appears across 1 boiler brand and 10 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has encountered an internal communication error between its main electronic control boards, meaning it cannot currently function or heat your home. (As reported on Worcester Bosch Greenstar 8000 Life/Style)
Pick your boiler brand for the 363 fix
Source
Information for the 363 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