D.51 Low
Your boiler is flagging a minor technical adjustment error regarding its internal fan speed settings.
Technical description: Offset for maximum speed
Typical repair cost: £80-160 (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.51 — no call-out fees, no surprises.
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Parts commonly replaced
- Main PCB
- Gas Valve
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