Low
d.67 on Vaillant ecoFIT Pure 835

Your boiler is temporarily pausing between firing cycles to prevent the burner from turning on and off too frequently, which protects the internal components and improves efficiency.

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

Remaining burner anti-cycling time (setting under d.02)

From this model's manual
Verified against the Vaillant Ecofit Pure 830 installation & service manual, page 31.
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

Wait up to 15 minutes for the countdown to finish naturallyCheck that your radiator valves are open to ensure good heat circulationEnsure your room thermostat is set high enough to call for heat

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