BoilerFaultCodes E85901 High
Boiler Fault Code E85901
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E85901 appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is experiencing a pressure or flow issue with the cold water supply that feeds your hot water tank, meaning you likely have no hot water. (As reported on Potterton Powermax HE)
Pick your boiler brand for the E85901 fix
Source
Information for the E85901 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