BoilerFaultCodes F0 239 High
Boiler Fault Code F0 239
Also written as F0239 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F0 239 appears across 1 boiler brand and 2 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 computer brain has detected an internal failure and can no longer safely operate, meaning your heating and hot water will not work. (As reported on Worcester Bosch Greenstar i)
Pick your boiler brand for the F0 239 fix
Source
Information for the F0 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