Boiler Fault Code 235

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 31 August 2026

Fault code 235 appears across 3 boiler brands and 15 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler's internal computer is confused because its internal identification settings do not match the specific components installed, causing it to lock itself to prevent incorrect operation. (As reported on Worcester Bosch Greenstar 2000)