2963 B High
Your boiler has detected an unusual temperature reading because a sensor or its wiring is not communicating correctly with the main control unit.
Technical description: Signal from flow and heat exchanger temperature sensor outside the permissible range – the connecting lead needs connecting correctly
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 2963 B — no call-out fees, no surprises.
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Parts commonly replaced
- Temperature sensor (NTC thermistor)
- Wiring harness
- Heat exchanger sensor clip
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