E4 High
Your boiler is not firing up properly, which means it cannot light the gas to provide heat or hot water.
Technical description: Ignition failure
Typical repair cost: £100-300 (including labour)
DIY fix possible
Check if your gas supply is active by testing another gas appliance like a hob.Ensure your credit is topped up if you have a pre-payment gas meter.Press and hold the 'R' or 'Reset' button for at least 2 seconds.
Protect yourself from future repair bills
A boiler cover plan would cover faults like E4 — no call-out fees, no surprises.
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Parts commonly replaced
- Ignition electrode
- Gas valve
- PCB
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