Hi.
Your Dyson has A clutch unit this engages the brush roller when you pull the handle back to vacuum.
Check the clutch control knob which is at the bottom left side of machine looking from the front.
It should rotate to drive position when handle is pulled back.
If it doesnt turn the knob by hand to drive & try the machine.
If you still have no brush rotation after doing all this then UNPLUG machine from mains supply.
Now lay machine on its side & remove the sole plate, This is the cover over the brush roller.
Turn the 3 plastic screws to unlock postition & lift sole plate off.
Now try to yurn brush roller using your hand. It should turn freely if it is difficult to turn look for any foriegn object obstructing the roller.
If no obstruction found then remove the brush roller from the machine & check the bearings in the ends of the brush roller one or both may be siezed up if they are then new brush roller will solve the problem.
If bearings are good then either the clutch is faulty or the second belt which goes clutch to motor has snapped & will need replacing.
It is difficult to fully explain the clutch removing procedure,
But there are service manuals available for these repairs at this site
http://dysonmanuals.llc.nu/
Brushes will not rotate. Changed the belt and cleaned the area well, checked the light bulb, seem good, but does not come on. Why do the brushes not rotate?
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