BoilerFaultCodesRavenheat 04E Fault Code
The Ravenheat 04E fault code means: your boiler's hot water sensor has failed, which means the system cannot accurately heat water for your taps and showers.. It appears on 7 Ravenheat models in our database.
Technical description: Domestic hot water (DHW) sensor damaged
What causes the Ravenheat 04E fault?
This fault occurs when the sensor responsible for monitoring the temperature of your tap water fails or sends an incorrect signal to the boiler's control board. The most common reason is the sensor’s internal components wearing out over time or the electrical wiring becoming loose or corroded due to heat exposure.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Search the official register for a qualified engineer in your area.
Gas Safe Register →Ravenheat models that show the 04E fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ravenheat 04E fault code information on this page is sourced and cross-checked against the official Ravenheat service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026