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If it's like my DC-07, the brush shouldn't spin if it's upright, and also won't spin if you don't have the clutch for the brush fully engaged. Make sure that the back of the unit is tilted off of the fully upright position, and check that the brush clutch is all the way engaged - there may seem to be a middle setting, but that isn't really where you want to be. Hoping that helps.
Nope, unless you see a big button on top of the hood that says brush. (which I doubt it does) That brush will stay running. It doesn't hurt anything really. When you lean the machine to upright it lifts the brush up off the floor.
First, check to make sure the brush bar is on. The switch is right next to the machine's on-off button, and it is easy to accidentally turn it off when you turn the DC 25 on or off.
Next, check for and clear any obstructions in the brush bar housing.
Finally, check for belt wear and replace if necessary. There is a very video online showing the procedure.
check brush the belt may have popped off and is binding or brush is binding clean brush of any debris thread/hair wrapped binding brush and check and or replace belt
Remove the bottom cover and replace the broken drive belt. Check that the brush will rotate freely--likely everything is jammed with hair and dust. The brush assembly should just lift out of the case and the end bearings will pull off. The brush needs to be removed to install a new belt anyway. There should be a diagram that shows how to install the belt (it has a half-turn twist).
Check the bottom of your brushes. It should have a long shaft sticking out of of the middle of it which locks on the base. If you don't see the shaft, the brushes are broken
Check two things with this model: if the top slider button has been activated it will turn the brush roll on. If not then you'll have to remove the sole plate and check the sides of the beater bar - sometimes this will get jammed and refuse to turn because clogging of dust or tangled hair/carpet thread takes up the thread wheels at the sides. Sadly this model has a permanent toothed drive belt that can't really be replaced by the owner. However check the slider control on the top of the main body / handle first before doing anything - as you know it has a two option slider - switching on without the brush roll function and switching on with the brush roll activated.
http://www.espares.co.uk/datastore/ProductManuals/350256.pdf
Check the above link to see if it helps. It shows you how to break down the DC15 to check for issues.
Also try inspecting the circuit board for loose wires. There have been several people who reported loose or burnt wires to be the culprit for the brush bar not working. The DC15 does not use a belt, but a motor that is control by the circuit board.
And I really believe that in your instance, the problem is a loose wire between the circuit board and the brush motor.
You can try calling their helpline at 866-MyDyson for further help
Check to see if the shaft on the brush block hasn't broken off. Otherwise it is the turbine that drives the brushes and is either clogged up inside or needs to be replaced.
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