E04
FAULT CODE
Ravenheat
DHW Sensor Damaged
Medium Severity
Engineer Required
On CS/WH/HE models, E04 indicates the domestic hot water sensor has failed.
Step-by-Step Fix Guide
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Step 1 Engineer only
Call a Gas Safe engineer to test and replace the DHW sensor
Gas Safe Reminder
Work on gas appliances must be carried out by a Gas Safe registered engineer. The steps above cover safe checks a homeowner can perform - any internal component replacement requires a qualified professional. If in doubt, always call an engineer.