F10 High
Your boiler's internal thermometer that measures water temperature is faulty or has a wiring issue, preventing the system from heating up safely.
Technical description: Delivery sensor error, sensor damaged wiring shorted or disconnected
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 F10 — no call-out fees, no surprises.
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Parts commonly replaced
- NTC Delivery Sensor
- Sensor Wiring Harness
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