F.4 High
Your boiler is failing to light the flame properly, which means it cannot heat your radiators or water.
Technical description: Ignition fault.
Typical repair cost: £100-280 (including labour)
DIY fix possible
Check if your gas supply is turned on at the meterCheck if other gas appliances in your home are working correctlyPress the reset button (flame symbol with a cross) for one second
Protect yourself from future repair bills
A boiler cover plan would cover faults like F.4 — no call-out fees, no surprises.
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Parts commonly replaced
- Ignition Electrode
- Flame Sensing Electrode
- Gas Valve
- Ignition Lead
*Affiliate links — we may earn a commission at no extra cost to you.