E04 Medium
Your boiler has detected a problem with the sensor that monitors hot water temperature, meaning you will likely have no hot water or inconsistent temperatures.
Technical description: Domestic hot water (DHW) sensor damaged
Typical repair cost: £90-160 (including labour)
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Protect yourself from future repair bills
A boiler cover plan would cover faults like E04 — no call-out fees, no surprises.
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Parts commonly replaced
- DHW Temperature Sensor (NTC Thermistor)
- Connecting wiring harness
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