BoilerFaultCodes E445 High
Boiler Fault Code E445
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E445 appears across 1 boiler brand and 6 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is having trouble managing the flow of water between your heating system and your hot water taps, which may cause your heating or hot water to stop working properly. (As reported on Navien NCB 28 HE)
Pick your boiler brand for the E445 fix
Source
Information for the E445 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