Low
d.06 on Vaillant ecoTEC plus System

This code is simply an information display showing the current temperature setting for your hot water, rather than indicating a fault.

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

Hot water set target temperature: Current value (Combination unit only)

DIY fix possible

No action is required as this is a status code, not an error.Press the 'i' button on your boiler control panel to return to the normal operating display.

Find a Gas Safe engineer
Search the official register →

Related fault codes

Related guides you might find useful