There are a few different possible reasons:
If the oven isn't heating to the baking temperature you set—it's too hot or not hot enough—the oven temperature sensor could be malfunctioning. Or the problem could be with the electronic oven control board, which controls oven functions.
You can test the oven temperature sensor probe by unplugging the range and measuring sensor probe resistance using a multimeter. You should measure about 1,080 ohms of resistance through most probes at room temperature. Refer to the tech sheet for the probe's resistance specification for your range. You can likely find the tech sheet in the control console or taped to the back of the range. Replace the oven temperature sensor probe if you don't measure the correct resistance through the probe. If the probe is okay, then you may need to replace the electronic oven control board.
ls oven functions.
If your oven uses a control thermostat instead of an electronic control board to control oven temperature, the oven control thermostat may have failed. The thermostat is the switch in the control panel that lets you set the oven heat. If the oven control thermostat fails, the temperature in the oven will be too hot or not hot enough.
Here are some DIY repair guides: searspartsdirect.com/diy/symptoms/wall-oven--repair/1234576
If you would like a professional repair, call Sears Home Services at 1-800-4-MY-HOME.