E1 High
Your boiler has become too hot and has shut itself down as a safety precaution to prevent damage.
Technical description: Overheated – try bleeding your radiators
Typical repair cost: £80-250 (including labour)
DIY fix possible
Check that your boiler pressure is between 1.0 and 1.5 barEnsure all radiator valves and the boiler isolation valves are fully openBleed your radiators to remove trapped air that might be blocking water flow
Protect yourself from future repair bills
A boiler cover plan would cover faults like E1 — no call-out fees, no surprises.
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Parts commonly replaced
- Overheat thermostat
- Circulating pump
- Main heat exchanger (if blocked)
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