27 Low
Your boiler's outside temperature sensor has developed an electrical fault, meaning the system cannot correctly adjust your heating based on the weather.
Technical description: Shortcut outside sensor temperature
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 27 — no call-out fees, no surprises.
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Parts commonly replaced
- Outside temperature sensor
- Wiring harness
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