E020 High
Your boiler has shut down because it has reached an unsafe temperature, triggered by a safety sensor that prevents the unit from overheating.
Technical description: Limit thermostat
Typical repair cost: £120-280 (including labour)
DIY fix possible
Check that all radiator valves are fully open to allow water to circulate.Ensure your system pressure is topped up to between 1 and 1.5 bar.Turn the boiler off and on again, or press the 'Reset' button to clear the lockout once the system has cooled down.
Protect yourself from future repair bills
A boiler cover plan would cover faults like E020 — no call-out fees, no surprises.
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Parts commonly replaced
- Limit thermostat (Overheat sensor)
- Circulation pump
- Main Heat Exchanger (Flushing)
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