Low
D.41 on Vaillant Atmomax

Your boiler is displaying the current temperature of the water returning from your radiators to help you monitor its performance.

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

Return temperature actual value

Shared across the range
This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s 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

No action is required as this is an informational status code, not a faultPress the 'i' button to exit the information menu if you wish to see the system pressureMonitor the temperature reading to ensure your radiators are heating up as expected

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