Placing the handle of my Dyson DC07 into its upright and locked position causes the beater bar to stop turning. It will not start turning until the handle is first lowered to the working position and the Carpet/Bare knob is moved to the Bare Floor position and then back to the Carpet position. Then the beater bar turns until the handle is placed into the upright position. What might be the problem?

Beater Bar Belt Likely Broken--Can Be Checked By Removing Cover(s) Next To Beater Bar (on bottom)

i had a similar thing happen and just got off the phone with dyson. there is a resettable switch on the handle. they told me to start the vacuum in the upright position, put it in the non upright position, then push and hold in the beater bar switch which is located next to the on/off button for 10 seconds and the beater bar should start to function once again

Hi its Darran at Dyson.

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).

Kind regards
Darran
Dyson Customer Service

Hi its Darran at Dyson.

Check that the brush control dial is in the centre position when upright and then moves forward when the head is released. If the brush bar is still not spinning when switched on in the vacuuming position, check the base for blockages and remove any threads or hairs from the brush bar as outlined in your user guide or on our website.

If you are still having difficulties, please contact our Helpline on 0800 298 0298 (UK) or 1866MYDYSON (US).

Kind regards
Darran
Dyson Customer Service

if your unit has a clutch it maybe that it is in the off position or the motor belt is broken your unit has to belts if its a clutched model 

Check your clutch to make sure it's engaged. There should be a knob on the foot of the vacuum that can be turned to stop the roller.

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. 

Sometimes dust,lint and thread can work its way into the bearings on both ends,take the beater bar out and see if you can turn it in your hand,if it doesn't inspect the ends and clean them.Use what ever you can find to pull out the threads.Or take it outside and hose it off.

The belt is in tact, but the beater bar will not rotate

If the beater bar does not spin freely, and the belt still seems to be in place, then you may not need a new clutch, but you may need to reset the clutch.  This is done very simply by keeping the beater bar section of the vacuum flat on the floor and reclining the handle all the way to the floor so the entire vacuum lays flat. There is a mechanism in the vacuum which resets the clutch. You will probably not hear anything when the clutch resets.  I sat on the phone for an hour and a half to hear this simple technique is built into the vacuum, but excluded from all instructions and website customer service information.