Low
d.10 on Vaillant ecoFIT Pure 835

Your boiler is currently showing the operational status of its internal pump rather than a fault, meaning the pump is active and circulating water for your heating.

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

Status of the internal pump in the heating circuit

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

Check if your thermostat is calling for heatWait 5-10 minutes to see if the code changes to another status like S.04If the heating is not working despite this code, check that your radiator valves are open

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Related fault codes

d.01View →d.02View →S.04View →

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