A09 High
Your boiler has stopped working because it cannot communicate properly with the gas valve that controls the fuel supply.
Technical description: Gas valve error – wiring could be disconnected or error with gas valve
Typical repair cost: £180-350 (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 A09 — no call-out fees, no surprises.
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Parts commonly replaced
- Gas valve
- Wiring harness
- Control board (PCB)
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