In your microwave, the diode allows current to flow one-way only, converting alternating current to direct current. If you notice that your microwave does not heat properly, you may need to replace the diode. This product is approximately 3 inches in length. Before completing this repair, be sure to disconnect the power source from the microwave. The diode is located inside the main compartment of the microwave, so you will need to open it up before you can complete this repair. This is an OEM part sourced directly from the manufacturer. Many of our customers have rated this repair as easy.
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★★★★★
★★★★★
Mark G - August 1, 2019
Verified Purchase
Great
Wife says microwave works great. (she's happy nef said)
★★★★★
★★★★★
Beverley M - December 4, 2018
Verified Purchase
Shipping
Part did not get part for three days past went it was to arrive.
★★★★★
★★★★★
Larry D - November 14, 2018
Verified Purchase
Fix perfect and easy to install.
Part worked great. Second time I have had to order to fix microwave and fit perfect. I usually take a digital photo of connections but forgot this time. Hooked it up to wrong side of capacitor and it blew 20A 250 V fuse. My dumb mistake but hooked it up right and replaced the fuse and microwave worked fine again. The only issue I had was with delivery of part by FedEx. Paid for 2 day delivery and FedEx sent me a message it was delivered on second day at 12:12 pm and placed on my front porch. I was home and went outside 5 minutes after supposed delivery. No part to be found. Called FedEx and got the runaround. Told to wait 3 more days then file list part claim with PartsSelect. Three days later part came in the mail. Guess that two bucks extra paid for faster delivery was a waste
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Customer Repair Stories
Average Repair Rating: 3.3 / 5.0, 6 reviews.
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Microwave oven ran but stopped heating
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."
... Read more/>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).
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Forrest from Eugene, OR
Difficulty Level:
Difficult
Total Repair Time:
1- 2 hours
Tools:
Screw drivers
2 of 2 peoplefound this instruction helpful.
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microwave not heating
removed a dozen screws-discarded large cap-replaced diode-replaced a dozen screws(took longer to replace them than remove for some unknown reason). Microwave now works(wife happy).
Mark from GREENSBURG, PA
Difficulty Level:
Easy
Total Repair Time:
30 - 60 mins
Tools:
Pliers, Screw drivers
2 of 2 peoplefound this instruction helpful.
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No heat
Removed case, Discharged HV capacitor and removed cooling fan. Unscrewed ground end of HV diode and unplugged from HV capacitor. Installed new diode by reversing the order. In my case, the problem was the magnetron was bad, so I replaced it as well.
John from SANTA CLARA, CA
Difficulty Level:
Really Easy
Total Repair Time:
30 - 60 mins
Tools:
Screw drivers
4 of 4 peoplefound this instruction helpful.
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Microwave not heating
Replaced diode works great. your website said 92% diode was problem and it worked. Order fuse in case old was blown did not have to use it.
I looked up the #1 reason for no heat for my microwave on the site , and using my model number found that 92% of the time it was the Black Sleeve Diode. Ordered the $15 part, and installed it within 30 minutes. Most of the time was used for removing the built in microwave and removing the cover. Replaced the diode by finding it on the
... Read morediagram that I printed from this site (free). Very relieved that we don't need to have our custom cabinetry re-sized to accommodate a new microwave. Thank you!
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Lisa from PARADISE, PA
Difficulty Level:
Easy
Total Repair Time:
15 - 30 mins
Tools:
Pliers, Screw drivers
28 of 28 peoplefound this instruction helpful.
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Sparks and loud hum from oven
1. I went to the internet to find the service manual for the Maytag microwave. 2. I opened up the oven and started measuring the resistance of the diode, capacitor, transformer, and magnetron between terminals and then to ground. The transformer and magnetron were well within the resistance limits. The diode was shorted in both direc
... Read moretions(+-). The capacitor was fully open in both directions -- high resistance. 3. I ordered the 2 parts, installed them, and ran the oven. Worked perfect first time. 4. Reinstalled oven and worked ever since (1 week so far). 5. The secret was that the transformer had a load hum. I figured the transformer was OK. The magnetron had no short between filaments and ground to filaments. The only two left were the diode and capacitor. The first two are about $200 -- almost the value of a new microwave. The $70 repair was well worth it. If the first two were still bad, then tempted to buy a new oven.
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3 questions answered by our experts.
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Terry
November 17, 2017
Where's is it located, how do I replace it ? Can't seem to find any instructions, thank you
For model number MMV5000BAW
Hi Terry, Thank you for the question. The Diode is located next to the capacitor in behind the controls. You will need to remove the cabinet from the microwave to access the Diode.The diode is held in by 2 screws. Be sure to disconnect the power source from the microwave.The microwave can hold a charge even when unplugged so use caution. You can discharge the capacitor,Do this by touching an insulated-handled screw driver to one terminal, then slide it toward the other terminal until it makes contact and hold it there for a few seconds.Repeat the procedure to create a short between each capacitor terminal and chassis ground.Hope this helps!
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Steven
November 20, 2018
My Amana microwave makes a loud hum and doesn't heat.
For model number ACO1560AB
Hi Steven, thank you for your question. There are a couple of parts that you should take a look at. The first part to check would be your diode. If that part is working correctly then it may be your magnetron that is the issue. I hope that helps. Good luck with your repair.
