F18 High
Your boiler's control panel and the internal computer are having trouble communicating with each other, meaning the display may not work or respond to your commands.
Technical description: User interface fault
Typical repair cost: £180-450 (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 F18 — no call-out fees, no surprises.
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Parts commonly replaced
- User Interface (Display) PCB
- Main Control PCB
- Connection Wiring Harness
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