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Hi There, Alec from VacuumSpot here. The roller on a DC14 does not have a separate power supply the way it works is when the motor is running there is a belt that runs from the motor to the clutch and then another from the clutch to the roller. As long as the floor selector on the front of the machine is set to carpet it will work when the machine is on. Without seeing your machine I would suggest that there is something not quite right about the clutch. If I was to take a guess it would be that the clutch to motor belt is broken or slipped off. I have made a video showing how to check the clutch and the brush.
DC14 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 eBayreasonably cheaply, but again good tools and DIY skills are required. Have a look at www.dysonmedic.comwhich has some excellent info on dismantling and repairing a DC07 (the DC14 is very similar to the DC07), but unless you have accessto such tools, and feel confident to tackle it, it's probably time to callDyson or a Vacuumrepairer.
Check that the brush control dial is in the centre position when the machine is locked upright. When you release the head and pull the handle back this dial should mopve forward to the on position. Once here, the brush bar should turn.
If this doesnt resolve the problem, please contact our Helpline on 0800 298 0298 (UK) or 1866MYDYSON (US).
Have a look at www.dysonmedic.com which has some very useful info on dismantling and repairing Dysons.
Although this site doesnt actually cover the DC14 yet, the DC14 is very similar to the DC07 so as regards dissassembling the machine, and replacing the clutch, my experience is that the DC07 info will enable you to do the job.
The "switch" that turns the beater bar on and off is called the clutch. It doesn't often fail, and for you to have two fail would be exceptional bad luck - so this may not be the problem. You are aware, of course, that the beater bar is always off when the machine is upright. The clutch automatically switches to "on" when the handle is lowered (unless the clutch knob is in the permanent off position). Sorry if this is stating the obvious, but we get lots of Dysons in for repair where the only problem is the clutch knob is in the wrong position. You say the belt is fine - but there are two belts. One goes from motor to clutch, the other from clutch to beater bar. The motor-to-clutch belt is replaceable (but you can't even see it without removing the clutch cover), while the other belt is integral with the clutch unit and the whole thing must be replaced. The trouble is... even to replace the motor-to-clutch belt you have to remove the clutch from the machine and that's quite an involved job. If you're considering doing the job yourself, look at www.dysonmedic.com, scroll to the bottom of the page and look at DC07 clutch replacement, and that will give you an idea of what's involved. Good luck!
The clutch problem needs to be looked at by a serviceman or professional who can repair Dysons. Slipping belts are often a sign of being overused or with carpet/textures that have caused the beater bar extra tension. I suggest if this model means much to you to get it repaired.