BoilerFaultCodes 2963 B High
Boiler Fault Code 2963 B
Also written as 2963B — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 2963 B appears across 1 boiler brand and 13 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 an unusual temperature reading because a sensor or its wiring is not communicating correctly with the main control unit. (As reported on Worcester Bosch Greenstar 8000 Life/Style)
Pick your boiler brand for the 2963 B fix
Source
Information for the 2963 B 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