I called the number BoldJava gave me. When I called, Jim told me to restart the machine and tell him error codes and if it rotates with no roasting chamber installed. I had already put it away and ordered some preroasted beans. A couple days later I dragged it out of the kitchen cabinet and plugged it in to check. Imagine my surprise when it started rotating when I turned it on. I set it up and did a roast of some Kenya beans. Uneventful, so I called Jim back and told him it must have been operator error. Sorry for the false alarm.