F.20 High
Your boiler has switched itself off because it has become too hot internally and needs time to cool down before it can be used again.
Technical description: Boiler has exceeded the maximum temperature and needs to cool down
Typical repair cost: £100-280 (including labour)
DIY fix possible
Check that all radiator valves are fully open to allow water to flow.Wait 30 minutes for the unit to cool down completely.Press the reset button (indicated by a flame with a cross through it) on the front control panel.
Protect yourself from future repair bills
A boiler cover plan would cover faults like F.20 — no call-out fees, no surprises.
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Parts commonly replaced
- Overheat Thermostat
- Circulation Pump
- NTC Sensor
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