F005 High
Your boiler is struggling to keep a flame lit after it has already started, which prevents it from heating your home properly.
Technical description: Flame disappears during operation
Typical repair cost: £120-350 (including labour)
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Protect yourself from future repair bills
A boiler cover plan would cover faults like F005 — no call-out fees, no surprises.
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Parts commonly replaced
- Ionisation probe
- Ignition electrode
- Flue seals
- Gas valve
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