D.65 High
Your boiler is struggling to spark or light the gas correctly, which is a safety mechanism preventing it from trying to ignite for too long.
Technical description: Maximum ignition time
Typical repair cost: £120-350 (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 D.65 — no call-out fees, no surprises.
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Parts commonly replaced
- Ignition Electrode
- Gas Valve
- Ignition Lead
- PCB
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