235 High

Boiler Fault Code 235

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 235 appears across 2 boiler brands and 11 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 having trouble communicating because they don't recognise each other's software versions. (As reported on Worcester Bosch Greenstar 8000 Life & Style)

Pick your boiler brand for the 235 fix

Ideal 235 1 model Worcester Bosch 235 10 models

Source

Information for the 235 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