125 High

Boiler Fault Code 125

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 125 appears across 3 boiler brands and 28 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 water isn't moving through the system properly, which is causing it to overheat and shut down for safety. (As reported on Baxi EcoBlue)

Pick your boiler brand for the 125 fix

Baxi 125 26 models Main 125 1 model Potterton 125 1 model

Source

Information for the 125 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