F.68 High
Your boiler is struggling to keep a steady flame alight because the gas supply is inconsistent or contains air pockets.
Technical description: Unstable flame signal error air in gas
Typical repair cost: £100-280 (including labour)
DIY fix possible
Check that your gas meter has credit and the isolation valve is fully openEnsure other gas appliances, like a hob, are working correctly to purge air from the pipesPress the 'Reset' button (indicated by a flame with a cross through it) once to restart the ignition sequence
Protect yourself from future repair bills
A boiler cover plan would cover faults like F.68 — no call-out fees, no surprises.
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Parts commonly replaced
- Flame sensing electrode
- Gas valve
- Ignition lead
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