D.18 Low
Your boiler is currently set to run the pump continuously, which is usually a configuration setting rather than a breakdown.
Technical description: Pump operating mode
Typical repair cost: £0-120 (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.18 — no call-out fees, no surprises.
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Parts commonly replaced
- None (Setting Adjustment)
- Printed Circuit Board (PCB)
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