F004 High
Your boiler is trying to start up but cannot successfully light the gas to create a flame.
Technical description: No flame during startup
Typical repair cost: £120-350 (including labour)
DIY fix possible
Check that your gas emergency control valve is in the 'on' positionIf you have a prepaid meter, ensure you have active credit and the meter is not lockedReset the boiler by pressing the reset button to see if it was a temporary glitch
Protect yourself from future repair bills
A boiler cover plan would cover faults like F004 — no call-out fees, no surprises.
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Parts commonly replaced
- Ignition electrode
- Ionisation probe
- Gas valve
- Ignition cable
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