Answer Hello Richard. You will need to check and see if the motor or the motor control board is bad. Also, make sure and check the bearings on the unit as well. You can test this with a multi-meter TJMA-DMT3. Here is a link on how to use a multi-meter. http://forum.appliancepartspros.com/oven-repair-including-ranges-cooktops/4810-how-check-continuity-ohmmeter.html Read More... Answered by AppliancePartsPros.com | Monday, March 28, 2016