Hi, we took the top cover off. There are 3 screws in back of top, real easy. Inside was a ribbon cable that plugged into a device in the back as well as other connectors. We unplugged and reconnected them and it worked. We think they either come loose because of vibration or just need to be reseated once in awhile but everything worked after that. Simple. Hope this helps.
If your washer has a selector switch on the control panel, make sure the button for your selection is pressed all the way in, or set properly.
Many washing machines have multiple-speed drive motors. Though it's uncommon, the drive motor may work fine on one speed but not on another. If the drive motor has failed on one speed, you need to replace the entire motor.