BoilerFaultCodes E002 High
Boiler Fault Code E002
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E002 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 has stopped working because the water pressure inside the heating system has dropped below the required level. (As reported on Navien NCB)
Pick your boiler brand for the E002 fix
Source
Information for the E002 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