0A31 High
Your boiler has detected an unusual temperature reading from the sensor that monitors water leaving the unit, causing it to shut down as a precaution.
Technical description: Flow sensor out of range. (sensor measures a temperature not in normal range.)
Typical repair cost: £120-£200 (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 0A31 — no call-out fees, no surprises.
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Parts commonly replaced
- Flow NTC sensor
- Wiring harness
- Main PCB
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