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If the self clean cycle works, that means that all your fuses are working properly and it means that your your broil element is working since self clean uses the broil element. It sounds like your bake element has just failed and needs to be replaced. During preheat the broil element is turned on 30% of the time to heat the oven quicker but the bake element is supposed to be on 100% of the time. If the bake element doesn't turn on, then the oven will cap out at about 280 degrees or so and never get warmer no matter how long you leave the unit on. Either way, below is a link to the bake element you'll need to order for your model. number.
CLICK HERE for bake element
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