How much does it cost to fix boiler error code 225?

Typical repair cost for the boiler 225 fault is £150-300 including labour.

225 High

Boiler Fault Code 225

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code 225 appears across 1 boiler brand and 4 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has detected that the water temperature is behaving unexpectedly compared to its safety settings, so it has shut down to prevent potential overheating. (As reported on Worcester Bosch Greenstar 12i System)

Pick your boiler brand for the 225 fix

Worcester Bosch 225 4 models

Source

Information for the 225 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