F.71 High
Your boiler has detected that a temperature sensor has stuck on a single reading, meaning it cannot accurately tell how hot the water is to safely heat your home.
Technical description: Flow NTC error – flow temperature sensor signal constant value
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.71 — no call-out fees, no surprises.
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Parts commonly replaced
- Flow NTC Temperature Sensor
- Sensor Wiring Harness
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