BoilerFaultCodesWhat the manual says
Manufacturer manualDisplay shows S.14 if the product is working correctly in hot water generation mode.
From this model's manual
Verified against the Vaillant Ecotec Sustain installation & service manual, page 50.
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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