If the control board functions correctly in the other modes, replace the oven temperature sensor, part number 252949, price $62.10. If the control board has other problems, it's better to have a professional repair person replace it, as there's a fair amount of wire changes to the new board configuration. You can buy the sensor at www.repairclinic.com.
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I checked the baking element for continuity. It read under 9 on the ohms resistance. Could this be a problem also????