We have a wall oven that at first would beep a F2 error code while cooking would get very hot had to cool it off before using again. However it is now to the point that we have to keep breaker off. When we turn breaker on the top element will come on and keep getting hotter and hotter and wont shut off. It comes on by itself as soon as the breaker is flipped back on. Have a new temp sensor in before we knew the element comes on by itself. The oven is a GE JKP15 WOA2WW.From what ive ready maybe need to change control board? also am having trouble finding a board for this because its hard to find this model. any help would be appreciated and thanks