F012 High
Your boiler has detected a problem with its internal temperature sensor, which means it cannot accurately monitor the water heat and has stopped working for safety.
Technical description: Sensor 5 fault
Typical repair cost: £90-180 (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 F012 — no call-out fees, no surprises.
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Parts commonly replaced
- NTC Temperature Sensor
- Sensor Wiring Harness
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