My microwave oven fan came on when the door was opened. Some speculation and googling confirmed my problems were microwave door switches. Back then, YouTube search looked like I could do it. I have a GE Over Range Microwave and it works great. My microwave has 3 switches and I bought 2 units. When swapping switches, I could easily tell which one was defective because the button would no longer click. I replaced this broken switch and another one as I had bought 2 new ones.
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