1 High
Your boiler has shut down because the internal water temperature has become too hot, likely due to a lack of water flow or a circulation problem.
Technical description: Temperature too high
Typical repair cost: £100-£350 (including labour)
DIY fix possible
Check that your boiler pressure is between 1 and 1.5 bar on the gauge.Ensure all radiator valves are fully open to allow water to flow.Check for any obvious obstructions in the external flue pipe.Reset the boiler by pressing the 'Reset' button once the temperature has cooled down.
Protect yourself from future repair bills
A boiler cover plan would cover faults like 1 — no call-out fees, no surprises.
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Parts commonly replaced
- Central heating pump
- Overheat thermostat
- Temperature sensor (NTC)
- Main heat exchanger (de-scaling)
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