Whirpool g2 Micowave

Hello I have a whirlpool over the oven microwave G2 oven. The model number is: GH9177XLQ-0. The microwave displays a F7 error code after about 15 seconds. The food items do not heat. I have unplugged the microwave for a few minutes and plugged it back in and problem still exists. The exhaust fan and lights over-oven & inside microwave still work. There are no other apparent problems. I’ve read in forums it could be a micro-controller, inverter, microcomputer board, magnetron, or loose connections. Can you help narrow down the cause? Any help would be greatly appreciated. Thank you. Earl