About a week ago, my wife went to use the oven and it would not heat at all. Neither bake or broil will work. You can set the temperature and the control board will click, as usual and will state that the oven is heating, but it does not. The clock works correctly and all ceramic stove components work correctly. Just the oven will not heat. I have already tried replacing the Control Board with the same results. What can I check next ?