BoilerFaultCodes 04E Medium
Boiler Fault Code 04E
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 04E 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's hot water sensor has failed, which means the system cannot accurately heat water for your taps and showers. (As reported on Ravenheat HE 80/90 / 25-30s)
Pick your boiler brand for the 04E fix
Source
Information for the 04E 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