0A High
Your boiler has detected an issue with the gas pressure or a component failure and has shut down as a safety precaution.
Technical description: Burner control switches to lockout
Typical repair cost: £120-£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 0A — no call-out fees, no surprises.
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Parts commonly replaced
- Gas pressure switch
- Ignition electrodes
- Gas valve
- Burner control unit
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