I just bought ahouse that had came with a stove. It is a magic Chef electric oven. Nowhere on the oven is the model number, including the schematic diagram on the back. On the front it just says "electronic control". I hit the "bake" triangle shaped button and then use the dial to enter the tempeature. I did feel the oven start to warm up but then it starting making a continuous beeping alarmlike noise and the display read "F-7". I have ni manual and cannot determine the model number. Any suggestions?