Boiler Fault Code 235

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

Fault code 235 appears across 3 boiler brands and 12 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 parts are talking to each other using different languages and need a software update or a compatible replacement part to work together properly. (As reported on Worcester Bosch Hideaway 90)