BoilerFaultCodes 263 High
Boiler Fault Code 263
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 263 appears across 1 boiler brand and 8 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler’s internal computer has encountered a software or hardware error and can no longer communicate with the rest of the system. (As reported on Worcester Bosch Greenstar 8000 Life/Style)
Pick your boiler brand for the 263 fix
Source
Information for the 263 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