BoilerFaultCodes 2959 High
Boiler Fault Code 2959
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 2959 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's main control computer is experiencing a software or internal communication error, meaning the system has safely shut itself down to prevent further issues. (As reported on Worcester Bosch Greenstar 27CDi)
Pick your boiler brand for the 2959 fix
Source
Information for the 2959 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