Low
D.124 on Vaillant ecoTEC plus

Your boiler is simply displaying a status message indicating that a smart energy-saving feature is currently active and functioning correctly.

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

SmartECO,currentstatus

From this model's manual
Verified against the Vaillant Ecotec Plus installation & service manual, page 76.
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 status codePress the 'i' button on your boiler display to return to the standard temperature view

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