F.17 High
Your boiler has detected that the electrical wiring is connected incorrectly or there is a problem with the mains power supply.
Technical description: Check the polarity of your system.
Typical repair cost: £80-160 (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 F.17 — no call-out fees, no surprises.
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Parts commonly replaced
- Printed Circuit Board (PCB)
- External electrical socket or fused spur
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