D.15 Low
Your boiler is displaying an information code because the pump that moves water around your pipes is spinning at a different speed than expected.
Technical description: Pump speed actual value
Typical repair cost: £180-350 (including labour)
DIY fix possible
Check that all radiator valves are fully openEnsure there is enough water pressure in the system (check the gauge)Restart the boiler to see if the advisory code clears
Protect yourself from future repair bills
A boiler cover plan would cover faults like D.15 — no call-out fees, no surprises.
*Affiliate links — we may earn a commission at no extra cost to you. Prices shown are starting prices.
Parts commonly replaced
- Circulating pump
- PCB (Printed Circuit Board)
*Affiliate links — we may earn a commission at no extra cost to you.