2966 B High
Your boiler is heating up too quickly and has shut down to prevent damage, usually because water isn't flowing through the system fast enough.
Technical description: Flow temperature rise in heat exchanger too rapid
Typical repair cost: £120-£350 (including labour)
DIY fix possible
Check that your radiator valves (TRVs) are fully open and not stuck.Ensure the blue filling loop handle is closed and the system pressure is between 1 and 1.5 bar.Restart the boiler using the reset button on the display panel.
Protect yourself from future repair bills
A boiler cover plan would cover faults like 2966 B — no call-out fees, no surprises.
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Parts commonly replaced
- Circulating pump
- Main heat exchanger (flushing)
- Flow/Return thermistors
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