Question about Kenmore Microwave Ovens

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Our micorwave was turned on for about 5 minutes without anything in it. It will turn on but will not heat anything up. Can we fix this by replacing something. Model #721.65222400

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It sounds like the magnetron may have either failed or is not being supplied with the extremely high voltage required to run it. Using the microwave with nowhere for the energy to go results in magnetron meltdown!
Make sure the !!!!capacitor is discharged!!!!! before attempting any sort of repair.

The magnetron may be all that is required but the diode pack may also have failed. These components are Safety Critical Items and MUST be replaced with identical units for continued safety.

Spare parts are available through the Manufacturers Authorized Agent. Go online to find a supplier near you.
Hope that helps.

Posted on Dec 30, 2010

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I was heating my tea and I heard a loud pop and the unit turned off...I thought I had blown a fuse and went out and checked fuse box..flipped all fuses and microwave still not turning on at all...micorwave...


The description you provide indicates the magnetron has failed, "heats food" and blown the main fuse in the microwave oven, since the unit is 10 years old it is much cheaper to replace with a new one rather than have it repaired.

May 15, 2011 | Amana Radarange Microwave Oven

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Microwave shuts off to soon?? REPAIRING/FIXING MICROWAVE OVEN FAN


I had picked up a very nice stainless steel covered microwave at a yard sale for 5 bucks. They had told me it worked fine but they neglected to tell me it only worked fine for 4 minutes and then it would shut its self down and then you had to wait 3 minutes for the reset to take effect and then you had another 4 minutes of cooking.

Let me tell you this got old in a hurry. I looked on the internet for expertise advice by stating my case in the google search bar. There were 20 different relays and fix this and fix and replace thats on there.

I decided to just take the back cover off and have a look for my self.
once I was inside i was touching this and poking that and noticed it was really dusty inside with plenty of left over spider homes so i used my computer air can spray and clean it all out.
I thought maybe it just might have been the problem as bad as it was in there so I plugged it in with the back still off and it shut down in 4 minutes just like before.
Something was wrong and I couldn't quit place it so I tried it again after the relay clicked back on. Then I saw it. The cooling fan was not turning.
I unplugged it and tried to turn it by hand after squirting some WD 40 on it and the plastic blade would turn but not the shaft the blade was attached to. So I got a pair of pliers and worked the shaft until it broke free. Squirted a little more oil on it and it became nice and smoooooth oh boy!!!

I then plugged it back in and set the timer to 5 minutes. By the way never touch anything inside one of these while it is plugged in.
The microwave approached the 4 minute mark and I stood there with my fingers crossed watching the fan run as smoooooth as can be.
Wallah!! it passed the 4 minute shut off mark and made it to the 5 minute mark until it quit because the timer ran out.
I did this again at 10 minutes and it made it all the way through without shutting down.
I now have a great working $5.00 microwave and it didn't cost me anything more but a little time and couple squirts of oil.

So if you experience the same early shut down time then now you can maybe good lucky like me and repair it your self by a flick of the fan blade.
I hope this will help you same some money. The Raz Shack

on Apr 22, 2010 | Microwave Ovens

1 Answer

My kenmore microwave will not heat, everything seem to be functioning but the food does not heat.


Assuming all lights are functioning, etc. Is there anyway that it has been set in the timer only mode? Usually a microwave ( their little computer operating system)can be reset, by unplugging and leaving unplugged for a few minutes then replugging. Depening on the age of the micorwave, it may be simply worn out. the newer ones do not lst anywhere as long as the older ones did..but then they cost a lot less as well.

Dec 16, 2010 | Microwave Ovens

1 Answer

My over the oven microwave turns off after a few


i would check your thermal cut offs inside he cabinet,there is a chance that your cooling fan is bad,even thought it may be turning it might not be turning at a fast enough rpm to proper;y cool the unit.
the last thing that i think would be bad is the control board.I hope this helps you get your microwave fixed

Feb 06, 2010 | Microwave Ovens

1 Answer

Microwave wont heat food. Everything else works.


Micorwave doesn't work when the megatron tube is out. That's probably why it won't heat up. Either replace microwave or the tube. You can get the number from Sears for the megatron tube by calling customer support.

Nov 09, 2009 | KitchenAid KHMS155LSS 1000 Watts Microwave...

1 Answer

Micorwave lights up, timer works but dish won't turn or heat.


You have not mentioned the model and make of the oven. You can check if there is a fuse between the highvoltage winding of the transformer andthe capacitor. If it is blown off replace the fuse, or you have to replace the magnetron.

Jun 14, 2009 | Frigidaire FMV156DC Microwave Oven

1 Answer

Panasonic nn-s558ba microwave won't power on


Lee,

Have Landlord replace unit after verifying that outlet has power.

In the future, follow manufacturer's cleaning instructions and DO NOT
run microwave without something in it (even a microwave safe cup of water).

Larry Hanson EH&S Specialist

Apr 04, 2009 | Panasonic NN-S558BA/WA Microwave Oven

1 Answer

Stuck on but no power


it is the problem of the faulty heating element .the heating element needs to be replaced to solve this heating problem.

Dec 29, 2008 | Microwave Ovens

1 Answer

Emerson Micorwave oven MW8108P


Generally, the most common causes of a failure to heat are:

- bad door switches or door switch mounts
- loose connection at the magnetron
- problem or loose connection on the control unit circuit board
- bad magnetron or other high voltage part such as high-voltage rectifier diode

If you or a friend decide to look into it, we have critical safety information, info on door switch diagnosis and
replacement, and disassembly information at our site, linked here on Fixya: http://tinyurl.com/yzjozk

Oct 30, 2007 | Emerson MW8108P Microwave Oven

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