BoilerFaultCodes Pump Overrun High
Boiler Fault Code Pump Overrun
Also written as PUMPOVERRUN — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Pump Overrun appears across 2 boiler brands 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 circulate water correctly after it has finished heating, which suggests the internal computer system is failing to signal the pump to run. (As reported on Glow-worm Ultimate3 Combi)
Pick your boiler brand for the Pump Overrun fix
Source
Information for the Pump Overrun 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 31 August 2026