9 High
Your boiler's internal computer is unable to communicate with the valve that controls the gas flow, usually due to a wiring or circuit board failure.
Technical description: Valve driver circuit error
Typical repair cost: £250-450 (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 9 — no call-out fees, no surprises.
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Parts commonly replaced
- Main Control PCB
- Gas Valve
- Wiring Harness
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