You may wish to double check your model number.
R401A is a type of refrigerant used in these types of appliances.
Here is the link to the DeLonghi Support website with the links to all their available dehumidifier user manuals:
http://web1.dlservice.org/dlservice/ext/delonghi/libretti.php?rec_a=10&rec_b=DHE
To view the Support Page just use your mouse to click on the link, which is the underlined and highlighted text just above. This will open a new web browser page automatically for you and allow you to view the information at the website indicated.
You may need ADOBE READER installed on your computer to read any PDF documents found.
You can download this free at
WWW.ADOBE.COM if necessary.
Click on the DOWNLOAD ADOBE READER button on right side of the ADOBE home page when you get there, the follow the onscreen instructions to install the software on your computer.
Thank you very much and good luck.