BoilerFaultCodes E005 High
Boiler Fault Code E005
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E005 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 lost its flame while trying to heat your water or home, causing it to shut down to stay safe. (As reported on Navien NCB)
Pick your boiler brand for the E005 fix
Source
Information for the E005 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