E.00 – .05 High
Your boiler has detected a fault with the sensor that monitors water temperature returning to the unit, meaning it cannot operate safely or efficiently.
Technical description: Return temperature sensor short-circuit. Sensor not connected 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 – .05 — no call-out fees, no surprises.
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Parts commonly replaced
- Return Temperature Sensor (NTC Thermistor)
- Wiring Harness
- Main Control Board
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