Low
d.01 on Vaillant ecoFIT Pure 418

Your boiler is simply running the internal pump for a few minutes after the heating has switched off to cool down the internal components safely.

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 in heating mode

From this model's manual
Verified against the Vaillant Ecofit Pure 830 installation & service manual, page 29.
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 required as this is a normal operating state rather than a fault.Wait approximately 5 to 10 minutes for the code to clear automatically.Check that your room thermostat is set to the desired temperature.

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