Stop working. brush was cloged. It there a reset button?

bad drive motor

Barring any electrical failure or loose plug the most common cause for the vacuum brush to stop turning is belt clogged with debris or string.
Unplug the unit and check the brush for string or debris (Hair) wrapped around the pully on either end. Clear this and check the belt to make sure it has not broken, stripped or simply slipped off. Usually the bottom plate is held on with just a few screws. Easy to remove and check Belt slipped off or stripped replace. Belt slipped off you can sometimes put back on and be vacuuming in no time.
Anything wrapped around the spindle a pair of needle nose pliers comes in real handy here. If you have snagged a rug, sheet or sock etc.. check the manual for a reset button. Some vacuums have this and all it takes is clearing the chute then resetting the switch. Good luck hope this helps!

sounds like the belt is stretched in the power head

There are numerous things that could cause this. It would be best to find a qualified Dyson repair person to determine the cause of your DC28.

Make sure the brush is cleared and clean, press the reset button, and try again.
If the motor runs, but the brush doesn't turn, it's likely due to a broken belt. Have it replaced by someone who knows what they're doing.
I strongly recommend taking it into an authorized shop.

Call cujst service

its overheating check to see if its cloged any where look behind brush roller

Not familiar with thi sbrand, but a reset is for when the brushes get jammed pr stalled, it will trip the reset. Make sure that the brsuh roll turns easily, also for a broken belt and/or bad brush roll. Some resets are for when the vac motor over heats, it will trip saving the motor. Usually this is for a jammed brush roll or a clog.

If the brush is spinning ok, and the belt isn't slipping, then probably the circuit breaker is bad, or the motor is causing the problem.