Oven Repair

I have a Dacor double wall oven, cps 227. I am able to select the cooking mode (ie bake, broil, etc), and set the temperature. The display indicates prebake (135 degrees), and stays on for 15-30 seconds and then turns off. There are no error codes displayed. This occurs for both the upper and lower ovens in all cooking modes. Is the problem with the ERC controller, the main or lower oven relay boards, or something else?