D.30 High
Your boiler is struggling to send the correct message to its gas supply valves, which usually means it cannot light safely.
Technical description: Control signal for both gas valves
Typical repair cost: £180-£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 D.30 — no call-out fees, no surprises.
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Parts commonly replaced
- Printed Circuit Board (PCB)
- Gas Valve
- Wiring Harness
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