Sorry to hear you're having difficulties using your DC14 on this particular carpet. It might help to check you have your brush control adjusted to the correct setting - you can find out how to do this in the user guide supplied with your cleaner. In case you don't have this to hand, here's an online copy:http://media.dyson.com/downloads/us/floorcare/manuals/dc14_opmanual_usa2007.pdf
It's also a good idea to follow the steps shown in our online support guide, to check that the soleplate is correctly fitted, and that there are no blockages in the cleaner head:http://www.dyson.com/support/help.asp?article=626&product=DC14-ANIMAL_US
You may wish to contact your carpet manufacturer to check it's suitable for cleaning with a vacuum cleaner equipped with a revolving brush. Manufacturers sometimes recommend cleaning certain types of carpeting using suction only.
If you have any further queries about using or maintaining your Dyson vacuum cleaner, please get in touch with us directly. One of our experts will be happy to provide the information and assistance you need. You can call us free on 08002980298 (UK), or 1866MYDYSON (US).
Dyson Online Customer Support