F.28 High
Your boiler has tried to light the gas but failed, meaning it cannot provide heating or hot water until reset.
Technical description: Ignition unsuccessful when starting up
Typical repair cost: £100-350 (including labour)
DIY fix possible
Check that your gas meter has credit and the isolation valve is openPress the Reset button (the flame symbol with a cross) for one secondCheck if other gas appliances in your home, like a hob, are working correctly
Protect yourself from future repair bills
A boiler cover plan would cover faults like F.28 — no call-out fees, no surprises.
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Parts commonly replaced
- Ignition Electrode
- Gas Valve
- PCB
- Spark Lead
*Affiliate links — we may earn a commission at no extra cost to you.