Low Information
S.14 on Vaillant ecoTEC Plus 840

Your boiler is working exactly as it should and is currently heating up the water for your taps.

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.

Technical description

Display shows S.14 if the product is working correctly in hot water generation mode.

What causes this fault?

This is not actually a fault, but a status message indicating that you have turned on a hot water tap. The boiler has detected a demand for hot water and is physically firing the burner to heat the water flowing through the internal heat exchanger. Once you turn the tap off, this code will disappear and the boiler will return to its normal standby or heating mode.

DIY fix possible

No action is required as this is a status message, not a fault code.Simply wait for the hot water demand to finish for the display to change.

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