jim, If the motor doesn't stop when the door is opened, it is most likely the due to a defective door switch. The door switch may also control a relay, which in turn controls the motor or fan as well as the heating element. I would start by replacing the door switch first. It is available at places like this. Part number 9 in the image is the switch. After you replace the switch, reevaluate and see what works, and what doesn't. Hope this helps, good luck.