F10 High
Your boiler's internal thermometer that measures the temperature of the water leaving the unit has stopped working correctly, which means the system cannot safely regulate heat.
Technical description: Flow sensor fault – possible causes: sensor damaged, short circuited or wiring broken check the wiring
Typical repair cost: £100-£180 (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
- Flow temperature sensor (NTC thermistor)
- Wiring harness
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