Low
S.030 on Vaillant ecoTEC plus Combi

Your boiler is currently in standby mode because it has not received a request for heat from your home's thermostat or timer.

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

No demand is present for the thermostat. Heating mode is blocked.

From this model's manual
Verified against the Vaillant Ecotec Plus installation & service manual.
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 your room thermostat is set to a temperature higher than the current room temperature.Ensure your heating programmer or smart thermostat hub is switched to the 'On' or 'Timed' setting.Verify that the battery in your room thermostat is not flat.

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Related fault codes

S.031View →S.032View →

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