IT seems the belt has slipped off and when I go to use it on the carpet setting, it makes a loud noise and the brushes do not turn

SOURCE: suden loud noise when vacuming carpet

Hi.

Check that brush roller (beater bar) is free to turn with no obstruction.
If it is still noisey after doing this try this site for Dyson repair manuals.

http://dysonmanuals.inc.io/

Chris.

SOURCE: LOUD GRINDING NOISE ALL OF A SUDDEN , LOOSE BELT ?

you will probably have a faulty roller bar take of panel on bottom of vaccum. Now remove the roller bar hold the bar by both ends and try spinning. This should be easy and smooth if not pull off the end cap these will be very tight and check the bearings in each end i think you will find a few small metal balls rolling around inside if this is the case you need to replace the bar

Ryan S

• 328 Answers
• Posted on Feb 27, 2009

SOURCE: belt wont turn makes a loud noise when put on carpet setting

If this is a Dyson with a protected belt that can't be replaced then it will have to be sent out to Dyson or get a Dyson servicepersonnel to check it over - protected belt motors are difficult to fix by yourself. If its clicking all the time, then it means the belt has to be replaced. In the mean time check that there are no obstructions on the beater bar and behind it and also check that the brush stop roller at the top of the hood is in the right position. It should move automatically when the handle is swung down in normal operation. 

SOURCE: ratchet noise, beater will not turn, belt not

Ok, so I had the same ratching noise and took the advice of many sites directing me to clean the brush. But like most I cleaned the brush and the noise continues and the brush does not spin. Reluctant to take it to get serviced I dug a little deeper and now it works just fine. This is what you need to do as removing any hair from just the brush part will not be enough.
Remove the entire brush bar from the bottom of the Dyson, this means pulling the bar out of the drive belt. This is not to difficult just use a little muscle as the belt will stretch. Once the bar is out grasp hold of the two plastic end caps on the brush bar which the brush bar actual spins in. These two caps are connected by a slim metal rod which runs through the brush bar. Place one hand on each side and begin to twist and pull until one of the caps comes off. Once the cap is off of the one side you can pull the other cap from the other side through the brush bar as this cap will be the one attached to the slim bar I mentioned above. If like mine you will see a ton of hair wrapped around these caps and inside the ends of the brush bar. Clean them out as best as possible.
After you clean it out, run the cap with the rod back through the brush bar, attach the other cap and twist and push together. Make sure the caps lineup which each other just like they were when you pulled it out. You'll notice how much more freely the brush bar spins between the two caps then before you cleaned it. Now, pull on the drive belt and feed the brush bar back through and attach as it was to begin with. This did the trick for me.

SOURCE: Dyson Makes a loud noise like something is impeding the

I would try changing the belt. Even though the belt may look fine it can be stretched or worn and that can cause loud noises. You can get dyson belts here:

http://www.vacbelts.com/dyson.htm