MMV4205DS1 Maytag Microwave - Instructions

The nightmare was that this microwave is installed under the cabinet....in order to get to the light bulb I had to pull out my stove then squeeze into the space between the stove and counter....my old microwave light bult was much easier to change.....Shame on Whirlpool for making this so difficult.....must be a better way to cover the light bulb so that we do not need a screwdriver to remove the door to get to the light bulb

Removed 1 screw, removed "burnt out" bulb and replaced it with new bulb.

Unless you have a very comfortable background with electronics and electricity, I don't necessarily recommend taking apart a microwave. If you are very handy and are going to be VERY cautious to follow the rules of discharging caps and testing voltages before moving forward, then go for it. That said, I took the microwave off and apart. Not knowing where to find the parts, I was fortunate that the installer put the instruction book for the microwave inside the front vent slot above the touchpad for reference. it details the location of every part and it tells you very clearly what each part you test should show specific to this microwave on your multimeter. Find this guide online if you don't have it. Turn on the microwave for 20 seconds with a glass of water to make sure it's not heating - that with the noise means it's eeither the magnetron, cap, or diode. Read the notes on this site for all of the basic things to look for with the magnetron, diode, and capacitor. Once comfortable with the guide, locations of those devices, and how to test, then take it down and apart. Unfortunately, I didn't do all those things in that order, and it only wasted a lot of time trying to find the parts. Once I found the parts and put all the screws and covers back for all the areas that didn't need to be accessed for the repair, testing went quickly. The diode was bad. Ordered a new one and had it in 3 days or so. That means your microwave will be apart and sitting somewhere for a little while until you get the part and have time to repair it. Putting the diode back isn't too bad. Reassemble the microwave and put it back up again. If i had to do it again, it would take me 20 to 30 minutes once the microwave was down and on a table. Also, I used some bricks with towels over them or you could use some sawhorses to keep the microwave elevated so you can plug it in and run it after installing the new component. Again, make sure you discharge the cap before touching anything again even if you didn't run it, but just plugged it in.

I turn off the income electricity by shutting down the corresponding circuit breaker. Then, I removed the control panel from the microwave which gave me access to the capacitor and adjacent diode. After that i unscrewed the defective diode and replaced it with the new one and BINGO!

removed two screws,lowered the glass shield,removed the burned out bulb and replaced it with the new one. I ordered the bulb from parts select and recieved it two days later. It was a pleasure to deal with them, and certainly use them again.

Unplugged the microwave to de-energize the unit. Removed 1 screw and the shroud on the range hood light; removed the light bulb. Removed 4 screws from each side and the front of the metal plate on the underside of the unit. Carefully lowered the plate to expose the light socket. Noted which wire was connected to each terminal (they are color-coded), then released the spring clip connectors from the terminals. Removed the 1 screw holding the socket in place then reversed the procedure to install the replacement parts.

I had some difficulty removing the glass plate because of the awkward (upside down) position of the screw that retained it. After replacing the burned out bulbs and replacig the glass plate the problem of replacing the screw involved my dropping the thing several times before I got the screw threads to catch. I got a screw thread to catch enough to hold the glass plate in position and left it at that.

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.

Whirlpool Microwave was purchased as used item, so installation in a new location required purchase of mounting template, wall bracket, mounting hardware. Granite backsplash cut out using wet/dry diamond blade and Ryobi 6.5 inch saw. Microwave exhaust fan removed and rotated for upward exhaust using modified exhaust plenum from existing stove exhaust hood. Installation of Microwave was the simplest part of the job. All mounting materials worked as required. A list of the materials provided in the hardware mount kit would be helpful, I would not have had to order the top mount screws separately if it was clear that they were included in the kit. Otherwise, no complaints.

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

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!