I have a wind tunnel vacuun and the roller will not turn

There is only one motor which turns the turbine and brush. Therefore, if the suction from the turbine works check the belt by removing the bottom plate of the vacuum and look for the belt attached to the brush roller or if only a piece of the broken belt is inside the unit. If the belt is attached and intact look for a mechanical switch to turn on and off the brush and make sure it is not on bare floor or off. Look on one of the edges of the brush assembly for the clutch which is attached to the mechanical brush switch with a rod. The clutch will close and open when you move the mechanical switch. If you cannot turn the brush unit by hand you may need to remove some objects such as string or hair from wrapped around the clutch or brush.