KHMC1857BBL1 KitchenAid Microwave - Instructions

Replaced both switches on the top door latch. Diagram shows the two switches on the lower latch? No success. Still had same message on the display. Replaced lower switch, fixed the issue.

The hard part was trying to find the light bulb locally. The locally sold light bulbs were either too long, not dual element or not powerful enough. So I ordered the light bulb straight from PartSelect. When it came time to install the new light bulb I carefully removed the screw holding the plate in position so as not to loose it in my gas stove. I needed the mirror to line up the light bulb and screw it in. Once it was in I verified operation and closed up the plate being careful not to drop the screw into my gas stove. Problem solved.

Read some instructions and easily found the fuse. Replaced it. Still didn't work. Took control panel off to check door switches. Nothing I read mentioned a second fuse. Tested and it to had blown. Ordered another one. Popped them in. Done.

Remove two screws from Vent Grille, one on either side, and remove one screw inside Vent Grille on right side. Pull Vent Grille off exposing the two Charcoal filters. Remove the two Charcoal filters by hand and replace with new ones. Reinstall the Vent Grille and tighten screws. That's it. I'm not handy (ask my wife) and if I can do it so can you.

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

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

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.

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

The original bulb came apart while unscrewing it from the back of the microwave, leaving the metal screw thread contact still in the socket. Since this is an over-the-range micriwave there isn't enough room to manuever needle nose pliers into the socket to remove the screw thread contact. So this is how we were able to remove it.
Unplug power cord.
Take a standard wine bottle cork and whittle down one end until it fits in the socket. Then, using a bit of pressure push the cork into the socket snd begin unscrewing the screw thread contact until it comes out of the socket. Works like a charm!

Followed instruction already on your website

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

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.

Piece of cake. One screw to release the dropdown light diffuser. Just remember, the you're screwing the new bulb in from a reverse perspective. Also this site sends the correct part the first time.