04, 05, 06, 08 High
Your boiler has detected a sequence of ignition or flame detection errors and has shut itself down for safety.
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 04, 05, 06, 08 — no call-out fees, no surprises.
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Parts commonly replaced
- Ignition Electrode
- Ionisation Electrode
- Gas Valve
- Electronic Control Unit (PCB)
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