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It takes a lot of suction to spin the brush. First make sure the suction is good. Make sure the bag and/ or filters are clean. Replace if necessary. Most turbo tools can be opened up to clean. Most have a lever that allows you to open it up to clean hair, dust, etc from the fan and fan shaft and other areas inside the tool. The tools pick up a lot of hair and debris and some will wrap around the moving parts building pup to the point the brush will not spin fast enough. The same thing can happen to the brush roll on your vacuum so be sure to clean it too and replace the belt at least twice per year.
If your brush roll is turning and your bag is not overly full, then the only other thing it can be is a clog where the bag connects to the vacuum. Turn the plastic part out away from vacuum and lift off to see if you have something clogging it. It would have to be something big, but not so big that it could not get past the fan. As a rule of thumb, KIRBY never clogs. I suspect that your belt is stretched out and your brush roll is not turning while on the carpet so the brush roll is just in the way rather than brushing your carpet to pick up dirt.
OK - there are two obvious things to check: 1. Make sure the brush is rotating. The DC14 has a 'brush control system" operated by a knob on the base in front of the right side wheel. Make sure this hasn't accidentally been moved to the "off" position. With it in the "on" position, switch the machine on, tilt the handle back and check that the brush roll is rotating. If it isn't, then there's a broken belt or a problem with the clutch mechanism in the brush control system. 2. If the brush is rotating, switch the machine off (and unplug it), turn it over and you will see a short length of clear plastic hose with spiral reinforcing that runs from the brush area to the motor. That hose often develops a split (which lets air in and reduces suction around the brush). Take that hose off (pull it off from the motor end and then unscrew it from the brush end) and inspect it carefully for any damage. If it is damaged, get a new one - don't try and repair the old one, it's not worth it.
I hope this helps - if so, please remember to rate my response. If you need more help, just post a reply here and I'll see what more I can do. Good luck!
the only thing i know about vacs is if there is no suction its blocked might have sucked up a piece of plastic bag and wraped around the fan hence no air or the screw that holds the fan has come loose take your filters out and turn on you may have sucked up fluid and not known it hence filters are blocked also brushes may seem alright but may be worn under half there fore springs are not at right tentsion if your armiture is black where the brushes run on may not be getting a good contact or if it smells burnt good chance you burnt it out then theres the power switch test with multi tester the check for loose terminals then test the field coils are correct ohms as well
Its possible that it may be blocked in the foot of the vaccum. try going through your instruction manual to locate details on how to disassemble the suction brush and connecting ducts. If you dont have one then use this link to download it. http://ubermanuals.com/node/1870