Low Information
D.1 on Vaillant ecoTEC plus Regular

Your boiler is briefly keeping its internal pump running to safely move heat away from the system after it has finished warming your home.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description

Water pump overrun – time for heat mode

What causes this fault?

This is a normal operational feature rather than a fault, occurring when the boiler finishes a heating cycle and needs to dissipate residual heat. It happens when the internal pump keeps running for a pre-set period to move hot water away from the heat exchanger, preventing the unit from overheating internally. The status will clear automatically once the internal temperature has dropped to a safe level.

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.

Find a Gas Safe engineer
Search the official register →

Related fault codes

Related guides you might find useful