F1, F4 High
Your boiler is unable to safely light the flame needed to provide heating and hot water.
Technical description: Ignition fault, boiler failed to light
Typical repair cost: £100-£350 (including labour)
DIY fix possible
Check that your gas prepayment meter has credit (if applicable)Verify that other gas appliances, such as a hob, are working correctlyPress and hold the reset button (flame symbol with a cross) for five seconds
Protect yourself from future repair bills
A boiler cover plan would cover faults like F1, F4 — no call-out fees, no surprises.
*Affiliate links — we may earn a commission at no extra cost to you. Prices shown are starting prices.
Parts commonly replaced
- Ignition electrode
- Flame sensing electrode
- Gas valve
- Ignition PCB
*Affiliate links — we may earn a commission at no extra cost to you.