F027 Low
Your boiler has lost its connection to the outside temperature sensor, which usually helps the system adjust its heat based on the weather.
Technical description: Short circuit of outdoor sensor
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 F027 — no call-out fees, no surprises.
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Parts commonly replaced
- Outdoor temperature sensor
- Wiring harness
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