D.10 High
Your boiler's internal pump is having trouble circulating water through the system, which is preventing your heating from working.
Technical description: Status internal heating pump error
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.10 — no call-out fees, no surprises.
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Parts commonly replaced
- Internal circulation pump
- Pump head
- PCB (Main control board)
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