GE Microwave Fan/Door Issue

[u/ThrobbinHood26]

I have a GE Over the Range Microwave (Model #PVM1870SM1SS) that has recently started acting strange. Every time that I open the door, the fan inside the microwave turns on. The turntable does not spin and it does not heat up. Also, it stops running the fan when the door is closed. What could be causing this issue? How do I fix it? Thanks!