BoilerFaultCodes 239 High
Boiler Fault Code 239
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 239 appears across 1 boiler brand and 5 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 unit has detected an internal electronic error and has safely shut itself down to prevent potential issues. (As reported on Worcester Bosch Greenstar 12i System)
Pick your boiler brand for the 239 fix
Source
Information for the 239 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 7 July 2026