Low
d.13 on Vaillant ecoFIT Pure 425

Your boiler is displaying the current operating status of your external hot water pump rather than an actual error message.

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

Status of the hot water circuit's circulation pump

DIY fix possible

Check if your external hot water timer or thermostat is calling for heatPress the 'i' or 'back' button to return the screen to the main temperature displayObserve if the code changes when you turn your hot water on or off

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