31 High
The boiler's internal thermometer that monitors water temperature for your radiators has developed a fault and is giving an incorrect reading.
Technical description: Centra heating supply sensor error (open or short)
Typical repair cost: £110-190 (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 31 — no call-out fees, no surprises.
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Parts commonly replaced
- Central heating flow NTC sensor
- Wiring harness
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