D.1 Low
Your boiler is briefly keeping its internal pump running to safely move heat away from the system after it has finished warming your home.
Technical description: Water pump overrun – time for heat mode
Typical repair cost: £0 (including labour)
DIY fix possible
No action is required as this is a normal operational status message, not a fault.Wait a few minutes for the status code to change once the cooling cycle finishes.Ensure your radiator valves are open to allow for proper heat dissipation.
Protect yourself from future repair bills
A boiler cover plan would cover faults like D.1 — no call-out fees, no surprises.
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