0A9 High
Your boiler has detected an electrical problem with the component that controls the gas supply, meaning it cannot ignite safely for heating or hot water.
Technical description: Gas valve electrical error
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 0A9 — no call-out fees, no surprises.
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Parts commonly replaced
- Gas valve
- Wiring harness
- Printed Circuit Board (PCB)
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