E.04 – .02 High
Your boiler has stopped working because it can no longer accurately measure the temperature of the water leaving the unit.
Technical description: Permanent fault. Flow temperature sensor open-circuited, sensor not or badly connected, bad connection or sensor fault.
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 E.04 – .02 — no call-out fees, no surprises.
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Parts commonly replaced
- Flow Temperature Sensor (NTC Thermistor)
- Wiring Harness
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