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Make sure the oven is getting 220 volts to it from the house to start with. If so, then it sounds like your bake element has failed or the control board is bad. The oven uses all the elements to preheat the oven quicker so if the bake element at the bottom of the oven isn't working, it will take forever to get up to temperature. You'd have to flip the circuit breaker off and remove the bake element to test continuity through it. If the element doesn't have continuity then you'd need to replace it. If the element does have continuity and the oven is definitely getting 220 volts, you'll need to order and replace the relay control board up above the oven because it isn't sending out power to the element(s) properly.
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