Beater brush does not rotate

i had the same problem, but was able to fix it by opening the brush compartment and cleaning the brushes, then separating the brush head from the body of the vacuum and hitting the reset button at the top of the brush compartment (per dyson online instructions). Works perfectly now.

Hi.

Your machine may have A clutch fitted,
When you pull handle back to vacuum csarpet ensure that the brush control dial moves to drive. If it is stuck in park or stop rotate the dial by hand to drive the roller should now rotate.

If it doesnt then chances are that one of the two clutch belts has snapped. You will need to remove the clutch in order to rectify this fault.

It is A lot to explain so try this site for help it has service manuals,
http://dysonmanuals.llc.nu/