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If the oven only gets to 250 degrees, there are a couple possibilities. First, how long does it take to get to 250 degrees approximately? Can you set the temperature to 350 degrees it just doesn't get there? And does the display show you it's still only 250 degrees even though you have it set higher?
OK so that means that your thermostat sensor is good because it knows that the oven isn't getting up to the correct temperature. This means that either your bake element is bad or your control board is bad. The oven uses the broil element at 30% during preheat to heat the oven quicker which is enough to get the oven to 250 degrees, but it won't get warmer than that unless the bake element is on 100% of the time during preheat. You'll need to pull the oven forward, remove the back sheet metal panel, and unplug the oven. Disconnect the 2 wires going to the bake element at the bottom of the element and use a multimeter to test continuity through the element. If the element doesn't have continuity, then replace it. If the element does have continuity, you'd need to replace the display board since that is the part that controls power to the elements.
Also, if you don't have a multimeter to test the element, you could remove the element and bring it into an appliance parts store and they'll test it for you and let you know if it's good or not.
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