BoilerFaultCodes Error 125 High
Boiler Fault Code Error 125
Also written as ERROR125 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Error 125 appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is struggling to push water around your heating system, which means it cannot provide hot water or heating until the flow is restored. (As reported on Potterton Titanium Combi)
Pick your boiler brand for the Error 125 fix
Source
Information for the Error 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