D.50 Low
Your boiler is notifying you of a minor technical calibration adjustment regarding the fan's lowest operating speed.
Technical description: Offset for minimum speed
Typical repair cost: £85-£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.50 — no call-out fees, no surprises.
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Parts commonly replaced
- Fan
- Gas Valve
- Main PCB
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