BoilerFaultCodes E432 High
Boiler Fault Code E432
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E432 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 struggling to detect when you turn on the hot tap, meaning it isn't heating water for your taps or shower as it should. (As reported on Navien NCB)
Pick your boiler brand for the E432 fix
Source
Information for the E432 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