3 High
Your boiler has automatically shut down because the water inside the system has become too hot.
Technical description: High water temperature limit
Typical repair cost: £120-350 (including labour)
DIY fix possible
Check that all radiator valves (TRVs) are fully open to allow water to circulate.Verify that your system pressure is between 1.0 and 1.5 bar.Press the reset button on the boiler control panel once the system has cooled down.
Protect yourself from future repair bills
A boiler cover plan would cover faults like 3 — no call-out fees, no surprises.
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Parts commonly replaced
- Circulation Pump
- Overheat Thermostat
- Thermistor (NTC Sensor)
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