D.13 High
Your boiler is having trouble moving hot water through the internal pipes, which usually means the circulation pump cannot start or is stuck.
Technical description: Hot water circulation pump
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.13 — no call-out fees, no surprises.
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Parts commonly replaced
- Internal circulation pump
- Pump wiring harness
- PCB
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