CC 800 Low
Your boiler has lost communication with its outdoor temperature sensor, meaning it won't be able to adjust its energy use based on the weather outside.
Technical description: Outdoor sensor defect available when accessory outdoor sensor is connected
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 CC 800 — no call-out fees, no surprises.
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Parts commonly replaced
- Outdoor weather compensation sensor
- Sensor wiring
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