E1 High
Your boiler has lost its ability to accurately measure temperature, causing it to shut down to prevent overheating.
Technical description: Control thermistor fault
Typical repair cost: £120-190 (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 E1 — no call-out fees, no surprises.
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Parts commonly replaced
- Flow NTC Thermistor
- Control Sensor Wiring
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