The motor on our Nytone CV-350 is shot. Should I buy a new motor or replace the unit?

The reset button to the vacuum unit is located on the upper left or right hand side towards the back. There is a small black circle about the size of a dime that has a white tab that pops out. If the tab is sticking out, you can reset the system and trying vacuuming. Typically, the reset button pops for a reason because of an overheating or defective motor. If the reset button is not popped, try turning on the unit from a vacuum inlet and see if you hear a clicking sound at the vacuum unit. If so, this means a new motor is needed. If a clicking sound is not heard, this can mean a bad relay in the unit.

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Sounds like the motor is shot. Time to get a new one.

Sound like the motor brushes is shot

By the time the brushes are shot, so is the armature. You need a motor.

If you haven't got the new motor, the three stage has more suction. The 1590 CV had the three stage motor untin they changed to the two stage not long ago. You can get either one for your unit. The two stage should be a little less expensive.

you are correct, the motor is shot. if you like the machine replace the motor. i would get an est. on the machine from your local vac shop and the go price them. in some cases its better just to get another machine.

I contacted to MD service technician. He explain, good advise. I follow his directions and cv350 works very good. Power getting as new. Thank you very much.

if your unit normally turns on when you open the flap on the wall inlets then you should check each inlet for a switch or a button, sometimes those buttons can get loose and fall into the wall making the unit stay on.

If the top comes off, it will be by the motor and exhaust. Just replace it with the new one, make sure you don't mix up any wires. Also unplug it from the AC first.

Either you have clogged filters, or the motor is weak, you could check the carbon brushes, otherwise replace the motor.