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If it is not something wrapped around the beater bar (lay flat and turn over to check, remove floor plate if necessary), an object loose in one of the pathways to the dust collector, or a failing motor then I'm not at all sure.
I'm sorry to hear you're having difficulties with your DC14. The brushbar is not designed to be removable on this model, so it's possible that damage has been caused, or that the brushbar has been replaced incorrectly. It's probably best if you get in touch with us directly so we can help you resolve the issue as quickly as possible. You can call us free on 0800 298 0298 (UK), or 1866MYDYSON (US). We'll look forward to hearing from you.
Although the machine is new, you may also find it beneficial to wash the pre-motor filter - under normal use, this should be done every 3-6 months. You can view a video guide on the correct way to wash the filter here:
Hopefully you should find following these steps resolves your problem. However, if you're still concerned, please get in touch with us free on 08002980298 (UK), or 1866MYDYSON (US), so we can run through some checks over the phone, and provide further assistance.
When turned on and set to sweep the sweeper makes a loud noise like it has something stuck in it but the brush is turning abut not does not have a lot of sucking power. It started the other day when a blanket with tassels got caught and wund up in the brush and sucked up in the sweeper a bit. Tried to pull out while running and came out but made the loud noise. If I take off the brush then it does not make the noise when on. I think it might be the belt grooves are worn and slipping when the sweeper is in the sweeping on mode. Sorry, do not know the technical sweeper terms.
I can't probably help you but I can tell you what Dyson told me. I have this same vacuum and it just started making that same noise. When I called their rep they had me take off the bottom plastic piece (comes off real easy by taking a coin and turning the three circles). Check to make sure the belt isn't broke. Then, they had me pull toward me the roller brush and turn it to get it seperated from the belt. Then, take off the belt. On mine, the spindle was full of dog hair clogging it. I took twizers and narrow pliers and pulled everything off. Then put it back together. It worked fine for the next few times I vacuumed then it started again. So, I did the same thing again and found this spindle covered with the hair again. Cleaned it, put it back together and it worked again. Today, while vacuuming I picked up a piece of string and that noised started again. Turned it over and saw that string on that spindle. Took it off, cleaned it and it worked again then started the screeching again. So, tomorrow I am calling a vacuum repair place. IF you have the same vacuum (which you do) it should still be under warranty. Dyson told me I would have nothing to pay unless I abused the vacuum which I did not. Hopefully I am not without it very long...I have two golden retrievers who do shed alot.