KHMS2040BSS1 KitchenAid Microwave - Instructions

issues started when door opened light would flicker then come on disassembled checked switches with a meter determined switch was faulty figured I'm in here replace them all because if one fails others will follow be careful removing actuator assembly plastic is brittle (remember this is above the stove subject to heating and cooling) plastic isn't as pliable installed all the switches perfecto oh by the way disassembled the faulty switch found contacts had arced from opening door while microwave is running use the buttons to stop will eliminate further issues

BEWARE: KMHS120ESS takes two charcoal filters. This site doesn't tell you that! I only figured it out after ordering one, receiving it, and removing the vent cover to replace it. So then I had to order another one and pay for shipping a second time (which cost almost as much as the filter itself). C'mon PartSelect, why are these not sold in a pair?

I looked up a YouTube video of someone with a similar over the oven microwave. That helped me get into the area behind the control panel where the door switches are. I checked the springs and the cam rocker? The thing that actually hits the button on the switch when the door closes. They were in good condition so I assumed the door switch was bad. There are two so I just purchased one figuring (hoping) that only one was bad. And lo and behold only one was bad. Bing bam boom. Put it all back together and I'm set. Not too difficult. Took a week of work because it takes like 50 days to ship. My kitchen looked like a hurricane after image because of all the parts scattered everywhere.

Remove top grill assembly and replaced filters,parts were delivered on time and fit as expected, Job well done!

Instead of telling you, i have question do you have any instructions on how to do the repair. It would have helped save time on the repair.

This job took longer then it should have, becasue I did not start right in the begining. I did figure it out quickly after the wrong start.

You were a big help in picking the right part to correct the problem. You should be able to help with the repair. Thank You

Replaced bulb by: 1 pulling plug on microwave to make sure not hot - no power; 2 used needle nose pliers with head part about same size that fit inside of socket; 3 opened pliers and held firm against broken metal part; keeping pressure of pliers against broken metal part of light bulb, slowly unscrewed the broken part from socket using firmly held opened pliers. The rest was a cinch...just screwed in new light bulb, plugged in microwave and viola - there was light once again.

This site was correct in description of what was causing the problem.
I found broken white plastic parts in base of microwave, found they came from switch holder interlock support. Only reason it took me as long as it did is I did not make a diagram of the wires that I had removed.( would help to have easy access to wiring diagrams or have them on the internet ) But on the internet I found a Video by repairclinic.com the photo in the video pointed me in the right direction and allowed me to get my wiring in order the microwave then started up and runs correctly. As to the plastic parts found in the base of the unit, this unit was a floor model and probably had the door opened and slammed shut many times, breaking the Top interlock. Thanks to this site

I unscrewed the bottom plate of microwave oven and took a picture of how the wiring was plugged in and unscrew the motor and put the new one in,it was so easy to do

The halogen light bulb is very tight in the socket and difficult to remove by hand. Read reviews by other customers who had the same issue and complained that they ended up breaking the bulb trying to remove it. If broken may require an on-site service technician to remove the whole assembly with additional much higher cost and time. I found wrapping some duct tape around the burned-out bulb made it easier to grip and remove the old bulb without breaking it.
Based on some You-Tube videos I watched newer models now use LED light panels which appear to solve this problem.

Followed instruction already on your website

It was a bit awkward because the microwave is mounted over my stove. I had to twist around and install the bulb and then replace the cover. It was a bit uncomfortable. It took me about 10 minutes to complete.

Put s pot under were you take the screw out.If you drop it you can get it easy

Removed the microwave from above the oven by loosening the two screws above the microwave. As the unit tilted outward lifted up and the whole unit came out all the time feeding the power cord through the cutout for the power cord. After it was out removed the cover and identified the capacitor and made sure it was discharged and removed and replaced the diode. tested before reinstalling and it heated up just fine. Reversed order and reinstalled . Very easy job maybe a second hand to help fish the power cord when installing and removing.

Removal of Phillip Head screws from Top vent and Control panel. Removed Torx head screw to remove entire switch assembly. Removed three wires to switch leads. Unclipped old switch. Replaced wires and inserted New switch in to clips. Attached assembly with Torx screw. Set Control panel back into place and screwed in top screw. Replaced upper vent with 2 screws.

This should be a 1 minute repair. However, there are a few issues. First, make sure you order the correct bulb. Mine is a halogen push in bulb, but the parts list showed a screw in bulb.
Remove power from the unit OR be sure that the light is turned off with the push switch.. The display will show the status as you rotate through the dim levels.
There is a single Phillips head screw holding the cover on the underside of the over stove microwave. carefully remove it. When loose the panel will drop down and you will find the old bulb in the center of the front of the opening. Remove the bulb. Now the important part. Carefully unpack the new bulb being careful to not touch the glass with your bare hands or fingers. Then insert the bulb into the socket.
If you unplugged the unit then plug it back in and push the switch to check that the new bulb works and is in the socket, then turn it back off.
Carefully lift the cover back into position and replace the screw. This is the hard part as you are working upside down and can't really see when it is lined up properly. When you have the screw back in and tight you are done. Press the light switch to enjoy your lit up stove again and put your tools away.
If you get your fingers on the glass bulb then clean it off with some rubbing alcohol and a paper towel to remove any finger oils before you put the cover back in place. Finger oils can boil with the heat of the lit bulb and cause the glass to explode. This holds true for any halogen bulb.