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If your oven is not reaching the proper temperature, you should inspect the heating elements, thermostat, and oven sensor. Before doing any of these, one important troubleshooting step is to give a good look at your oven door gasket.
Does it have rips? Tears? Is it pulling away from the oven? Believe it or not, this simple range/oven part can make a big difference in how the oven works. If it is going bad, you will lose heat through the door. The door gasket is designed to keep hot air inside the oven. When this range/oven part starts going bad, the heat will leak out into the kitchen, reducing the overall temperature of your cooking.