D.14 Medium
Your boiler is struggling to control the speed of its internal pump, meaning water may not be circulating through your radiators efficiently.
Technical description: Pump speed target value
Typical repair cost: £220-£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.14 — no call-out fees, no surprises.
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Parts commonly replaced
- Main Circulation Pump
- PCB (Printed Circuit Board)
- Wiring harness
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