Low
d.11 on Vaillant ecoFIT Pure 835

Your boiler is currently reporting on the operational status of an internal pump that helps circulate water through the radiator system.

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 heating circuit's shunt pump

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 status code, not a lockout fault.Check that your room thermostat or timer is calling for heat.If the code persists and you have no heat, try resetting the boiler.

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