125 High

Boiler Fault Code 125

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 125 appears across 7 boiler brands and 43 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 hot water is not flowing around your heating system correctly, which is causing it to shut down to prevent overheating. (As reported on Baxi EcoBlue System)

Pick your boiler brand for the 125 fix

Baxi 125 24 models ECA 125 1 model Ideal 125 1 model Main 125 6 models Potterton 125 9 models Sime 125 1 model Worcester Bosch 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 7 July 2026