Low
D.72 on Vaillant Atmomax

Your boiler is briefly running the pump after heating water to prevent the internal parts from getting too hot.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

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.

What the manual says

Manufacturer manual

Pump overrun time after warm start

Shared across the range
This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s manual.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

DIY fix possible

No action is typically required as this is often a normal operational status rather than a faultEnsure your radiator valves are open to allow heat to dissipateMonitor the display to see if the code clears automatically after a few minutes

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