F.01 High
Your boiler has stopped working because a sensor that monitors water temperature has lost its connection or stopped sending a signal.
Technical description: The Flow NTC (Negative Temperature Coefficient Thermistor) cable is either defective or broken and needs to be replaced
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 F.01 — no call-out fees, no surprises.
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Parts commonly replaced
- Flow NTC Thermistor
- Sensor Wiring Harness
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