I am sorry but there are no reset switches for these units.
Most likely what has happened is the motor overheated and shut itself down.
Please allow the unit to cool down for at least an hour.
If it does not restart then a wire has come loose or the unit has had a motor failure. If the moptor has burned up you will smell an acrid oder coming from it. Other wise it is a bad connection somewhere.
Unfortunatly there are no schematics available for these units. Your best bet would be to take it to a repair facility or have a handyperson look at it for you.
If the problem persists you need to have the carbon brushes of the motor looked at. This is the most common reason that electric motors get hot, aside from abuse that is.
Thank you for the accept.