E.00 – .04 High
Your boiler has detected a problem with the internal sensor that monitors water returning from your radiators, meaning it cannot safely regulate its temperature and has stopped working.
Technical description: Return temperature sensor open-circuit. Sensor not or badly connected.
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.00 – .04 — no call-out fees, no surprises.
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Parts commonly replaced
- Return temperature sensor (NTC thermistor)
- Sensor wiring harness
- PCB
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