I ran a test as noted in the supplied manual, it said to replace the control module. Easy to find in the parts bin of Appliance Parts Pros, ordered it and received it in a week. After being installed the oven would still not heat beyond 280 degrees. I then looked into possible problems suggested by APP and found that the typical problem might be the heating element, bingo. The element was partly melted, so another order through APP on a Friday afternoon and on Monday I received the new part. That fixed it. I tried the old control module to see if I really needed it or was the problem only the second fix, the heating element. Not so lucky. The fix needed both parts.