BoilerFaultCodes E353 High
Boiler Fault Code E353
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E353 appears across 1 boiler brand and 7 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has detected an issue with how it manages water flow and pressure, which means it cannot safely produce hot water for your taps or home. (As reported on Navien NCB CE)
Pick your boiler brand for the E353 fix
Source
Information for the E353 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