Low
S.14 on Vaillant ecoTEC Pro 28

Your boiler is working normally and is currently firing up to provide hot water to your taps or shower.

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

Burner connected, hot water generation (Live monitor)

From this model's manual
Verified against the Vaillant Ecotec Pro installation & service manual, page 45.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

What causes this fault?

This is not actually a fault, but a status message indicating that the boiler has detected a demand for hot water. It occurs when you turn on a tap or shower, prompting the burner to ignite and heat the water currently passing through the domestic heat exchanger.

DIY fix possible

This fault may be fixable without an engineer. Check your manual first.

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