While some oven models have a light that turns on automatically when you open the electrical door, others have a manual switch that you can use to manually operate the light. If your oven has a manual On/Off switch, you can turn on the light to check on your food without opening the door. The switch is provided on the control panel or you can find it somewhere above the door. When you set the switch to the ‘on’ position and the light bulb doesn’t turn on, you’ll have to replace it with the new one.