F6,F7, High
Your boiler has detected a communication or electrical fault with the sensors that monitor the temperature for your heating and hot water, meaning it cannot operate safely.
Technical description: Central heating flow thermistor faultDHW thermistor fault
Typical repair cost: £120-£200 (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 F6,F7, — no call-out fees, no surprises.
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Parts commonly replaced
- Central heating flow NTC thermistor
- DHW NTC thermistor
- Wiring harness
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