The things i have seen in a microwave not working are the high voltage diode shorted or opened and the 12v relay on the control board which drive the voltage on the magnetron.
Broken microwave door button.
Since the handle actuator is made of plastic it can break from normal wear.
If the button won t push in to open the microwave door one of the little ears that holds the button in place has broke off and is keeping the button fron being depress.
I think i have never seen a door switch broken unless someone physically damages them.
It then contacts the door latch assembly and releases the door hooks to allow you to open the door.
You might have an issue with the door latch lever or button if your microwave will not open.
Find out how to test and replace the latch assembly on your microwave.
The handle actuator is connected between the door open button and the door latch assembly.
In most of the cases where the microwave door is not opening the cause comes out to be an issue with the door latch button or lever.
If the door on your microwave oven won t open you may have a problem with the door latch lever.
If the handle actuator is broken replace it.
2 of customers exhaust fan not working.