How to Troubleshoot & Replace Whirlpool AP4429884 / W10269458 Microwave Door Interlock Switch

Replaced all three door switches. 

Replaced the parts with diagrams provided by Appliance Parts Pro but had to figure out how to disassemble the switch locations. 

Replace door switches 

Installed new switch 

I watched You Tube video and it made me confident to do the repair 

I removed microwave from wall and started to disassemble. Located the two switches for the door. Had to remove quite a few parts to get to the door switches. Once I was able to get at the bracket I replaced both switches and reassembled the microwave and put it back on the wall bracket above our stove. Open the door and light comes on and works all the time. With the parts and shipping it only was $40.00. By replacing the parts I saved myself from purchasing a new microwave. Took me about 2 hours from start to finish. 

Replaced the 3 switches. This fixed the problem. After reviewing the feedback from previous cases on this problem, I was very careful to not break the small plastic retainer arms. 

Replaced the parts. Was very easy to do, since I had the exact parts to replace the old parts. Found a YouTube video to show the process. Was really simple. 

My KitchnAid microwave would not register that the door was closed so it wouldn't start. After unplugging and resetting several times, it still had problems. I then ordered the microwave switches (there are four in my model). After getting the switches I noticed videos on how to test the switches with an ohms meter. It was easy to take the front panel off then identify which of the four switches was bad. Replaced that switch and it works great. My suggestion in the future would be to test the switches first so you only have to order what you need. The switches are rather expensive for what they are. 

Replaced both Interlock Switches inside the upper slot of two-door closure slots. Replaced Fuse located inside at rear wall.