Machine Will Not Spin Help!!!!!!!!!

The Machine Is Putting Up A Code F-06. Which Is Drive Mtor Tach. Error. That Is Because Motor Is Not Turning. I Checked Motor Continuity And It Is Ok. I Don’t Know If It Is The Motor Control Unit Or Central Control Unit. I Checked Wire Connections Also And They Are Ok. Is There A Way To Check These Boards To See Which One It Is Without Replaceing One And Have It Be The Wrong One. These Are Not Cheap Parts.