BoilerFaultCodes C4237 High
Boiler Fault Code C4237
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code C4237 appears across 1 boiler brand and 1 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 internal computer has developed a serious electronic fault and can no longer control the heating process safely. (As reported on Worcester Bosch CDi Classic)
Pick your boiler brand for the C4237 fix
Source
Information for the C4237 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