F6 Low
Your boiler has lost connection with the sensor that measures the temperature outside, which helps it run more efficiently.
Technical description: Outside sensor 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 F6 — no call-out fees, no surprises.
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Parts commonly replaced
- Outdoor weather compensation sensor
- Sensor wiring harness
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