Hi! It sounds like you have a broken or stretched belt. The belt controls the brush roll. If you are using the vacuum on carpet, you need the brushes to spin to agitate the carpet fibers. Below are step-by-step instructions on how to replace your belt. I have also included a link to the instruction manual if needed.
1. Lay cleaner flat and flip to expose nozzle base. To remove nozzle guard, use Phillips screwdriver to remove the screws.
2. Lift and remove brush roll and dispose of old belt if you see one.
3. Slide belt (style 19) onto motor shaft.
4. Place new belt on area of brush roll without bristles.
5. With new belt in place, pull and slide brush roll into nozzle making sure that the brush roll end caps are in the correct orientation.
6. Replace all screws to replace nozzle guard.
http://dirtdevil.com/file/898/
Hope this was helpful!
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