DC7s have two drivebelts that turn the brush bar - one connects the output of the motor to the clutch, the other connects the clutch to the brush bar.
You can check the latter simply by removing the sole plate and looking.
Unfortunately the other belt is hidden under a plastic cover, so you cant see if it is okay or not without some dismantling. This cover is not easy to remove and requires a Torx driver to under the securing screws.
If, after removing the cover, the other belt is okay, then you have a faulty clutch.
New clutches are available on eBay reasonably cheaply, but again good tools and DIY skills are required.
Have a look at www.dysonmedic.com which has some excellent info on dismantling and repairing a DC 07, but unless you have access to such tools, and feel confident to tackle it, it's probably time to call Dyson or a Vacuum repairer.
SOURCE: brushes do not spin
I have the same problem. I noticed that on mine where the switch is I have a spring that came off. I'm trying to figure out how to get the cover off so I can see where it should be connected. One end is still attached to the switch but the other end of it isn't attached at all. I'm not sure if this is the problem,but we will see. Mine was working fine the last time I used it and I always clean the brushes after every use.
SOURCE: The brush does not spin when making contact with carpeting
I tried the electrical-tape-around-the-wooden-spindle technique. After a minute or so, it's back to functioning normally.
SOURCE: In Carpet setting, the vacuum brush does not spin
I put 3 turns of electrical tape around the area of the beater bar that meets the vacuum belt. This solved the problem short of replacing the beater bar.
SOURCE: I have a Bissell Pro Heat 2X carpet cleaner and
The reason for the brushes to stop when it is above any surface is there is a switch in the handle that stops the brushes so it dont burn your motor up it may have a faulty switch.
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