MT1044CB Microwave - Instructions

Access is via RT. SIDE Panel as you face microwave. There are three screws on the bottom right edge to loosen. After that the side panel slips down and off. the fuse is located in the rear near where the power cord comes in. It is the white ceramic tube 1/4" in dia. and 1-1/2" long. Pull it out like any fuse and replace with new one. Reassemble and you are done!

I had to unmount the over-the-range microwave oven to be able to gain access to the interior of the oven. Complicating removal (and re-installation) was the fact that there is a "pot-filler" faucet installed directly underneath the oven. In retrospect, I should've removed the faucet before doing the repair, but "c'est la vie."

After I got the microwave down, removing the case was also "interesting." I get bonus points for the fact that the previous owner must've had to replace the same diode before - and then re-assembled the microwave case incorrectly - thereby adding to the confusion (BTW, the service manual that I found online said nothing about how to remove the oven's case).

To remove the case, undo all the screws holding it on, and then rotate the case upwards from the back while also pulling the case backwards. There are crimped folds on the inside of the case that mate with the back edges of the front of the oven's chassis, and these folds have to be unclipped from the chassis in order to remove the case.

Replacing the diode itself was the easiest part of the job. The two connectors on the diode are of different types, making it impossible to install the diode with the wrong polarity.

BTW, the diode that had failed was not an OEM diode; I suspect it was a generic component that had been installed by a repairman sometime between 2004-2008 (when our home's original owners still owned the home). On the other hand, the new diode from PartSelect is an OEM part (it came packaged in a sealed Whirlpool bag).

The fact that the oven had stopped heating indicated that it was either the high-voltage diode or the magnetron that had failed. Since a replacement diode costs ~ 1/10th as much as a replacement magnetron, I figured it made sense to replace the cheaper part first. Fortunately, this fixed the problem.

One last thing: I tried testing both the old and new diodes for conductivity and polarity using my volt-ohm meter (VOM), but I was unable to get either diode to "turn on," even though my VOM is powered by a 9-v battery, and I used the 2-Mohm range setting. I guess the test voltage of my el-cheapo VOM isn't high enough to exceed the diode's threshold voltage, (even though I have successfully used this same VOM to test low-voltage diodes).

I used my pocket knife to open the package. I opened the door and removed the plate and set the guide down and put the glass plate back.

Turn off power to microwave (kitchen circuit breaker) Remove 3 sheet metal screws bottom front, disconnect electrical connections to motor and lights, remove defective motor(1 screw), replace with new unit, replace screw, re-attach bottom (3) screws, test. Replacement motor cost via this supplier was 1/3 of what local appliance repair store would have charged.

Set it in the oven, wonderful!!!!!

My repair went terrible as I was sent the wrong motor 2 times. My stove sat in the middle of my small kitchen for 2 weeks. Finally the 3rd was the correct one except I didn't have the right nut so I waited another day for that to be sent. Everything working good now, I just hope the bottom fan doesn't go out after this experience.

hardest part was taking the microwave down off of the wall to gain access to the diode. Thought if was the transformer but ended up being just a blown diode. remove and replace and bench test. that part took 15 minutes . moral of the story don't boil water under the side of the microwave that holds the electric components.

Information provided on the web site by Part Select, were helpful and encouraging to select and buy the part needed to repair the appliance. No doubt, a skilled person having background in the repair of appliances should attend such repair job.

Pretty easy tear down and assembly once I removed it from cabinet (built in micro)

went to you tube and found a segment compatible to my issue.called the web site and ordered the thermostat fuse and ceramic fuse in case i had the wrong one purchased at the locale H/Depot. The only issue was I did not know that there was 2 different thermo fuses,,one controls fan and the other a basic one. luckily the fan wasn't the one that was blown.The woman i spoke to was very helpful and my order was AT MY HOUSE in less then 24 hours.

Simple replace