Question about Kenmore 80402 Microwave Oven

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Kenmore microwave model 721.80409400 is noisy while operating like a loud 60 cycle HUM or BUZZ otherwise works OK

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Sorry to read about your problem, I hope this helps you out.

you may have a magnetron issue, or these other issues

  1. Shorted HV diode, magnetron.
  2. Burnt carbonized food in or above oven chamber.
  3. Shorted winding in HV transformer.
  4. Frayed insulation on HV wiring.
Microwaves must be serviced by technicians due to the inherent dangers involved in repairing these appliances. Internal capacitors can retain a lethal electrical charge even though the unit is completely unplugged. A microwave radiation leakage test must be performed on the unit following any internal component repair.
I tried to help you. Please help me and Rate/Vote on my response. We take the time to answer your question's. take the time to rate us.Thanks and good luck

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Posted on Jan 02, 2011

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1 Answer

Microwave occasional loud buzz


make this test and fix it. God bless you


  1. MagnetronIf your microwave is emanating high pitched or growling noises during operation, the magnetron could be going bad. Normally a nearly silent part, the magnetron uses high voltage and induces the frequency required to cook food. Although normally not a safety hazard to operate, this is a sign that the magnetron is failing and will need to be replaced as soon as possible.
  2. Exhaust fan motorIf your microwave is making a very loud humming noise during operation, it could possibly be the exhaust fan motor. If defective the part will need to be replaced to silence the appliance once more.
  3. Stirrer motorAnother leading cause of a noisy microwave is an expired stirrer motor. With use this part becomes worn and makes a loud grinding noise, which is usually a leading indicator that the part needs to be replaced. The stirrer is a metal blade that is slowly turned by the motor. This action disperses the microwave energy in a random pattern, which heats the food evenly. If the stirrer motor is determined to be nearing expiration, it should be replaced to halt the grinding noise.
  4. Turntable motorA very common cause for a noisy microwave is a worn out turntable motor. This is a relatively easy repair and will put an end to the noise once replaced.

Nov 14, 2013 | Jenn-Air JMV8208AAS Microwave Oven

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Kenmore microwave Model No. 721.62463201 runs but does not heat and has a terrificately loud buzz. All lights displays are normal


Hello there:
There's no heat, but it buzzes loudly When the microwave won't heat, but you hear a loud buzz, you usually have a defective power diode, high-voltage capacitor, or magnetron. I recommend that you consult with a qualified appliance repair technician for help in determining the problem and deciding what to do about it.
And if you have your warranty for this you can use it to ok
Hope this helps best regards mike

Nov 19, 2010 | Kenmore Microwave Ovens

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Model JE2160BF03 Microwave works but it does not heat.


Hi


Thanks for using FixYa. Microwave not heating properly is caused by a power relay going bad, cold solder joint on the board and/or magnetron (this is only if it makes a loud hum/buzz sound). Also the door hooks and the door-release button should be checked. Please do rate the solution if the issue is resolved or post a comment for further assistance.



Thanks
Rylee

Jun 01, 2010 | GE Microwave Ovens

1 Answer

Turns on and rotates, does not heat the food. noisy hum


Hi


Thanks for using FixYa. If it’s a loud hum/buzz sound then 90% it’s usually a bad magnetron and other times it’s a bad high voltage diode. However, from what you have described it seems to be the magnetron. Please do rate the solution if the issue is resolved or post a comment for further assistance.


Thanks
Rylee

May 30, 2010 | Whirlpool 1.6 Cu. Ft. Over-the-Range...

1 Answer

It makes a sound when on and smells like burning


If it's an arcing sound, there may be grease or food particles on or behind the waveguide cover or in the area of the turntable motor.

Otherwise, it's likely to be a failing high voltage part:

- A sound like gurgling into an empty coffee mug is one symptom of a failed magnetron, and yet the mag can be bad without that sound. Usually it will not heat is this is the case.

- A loud buzz, hum, or groan is usually a shorted high voltage rectifier diode, but if this were the case, it would not heat.

- Sometimes a high voltage transformer will cause a loud hum and burning smell, too.

Please note that FixYa is not currently notifying us Experts when Clarification Requests are answered.

To allow us to help you effectively (at no charge), please post a
NEW problem to FixYa, and please include your brand name and the full model number from the tag in or on the unit, and your specific symptoms.

Let us know which of the examples we gave seems to be closest to the sound you're experiencing.

Jan 29, 2010 | GE JVM1650 1000 Watts Microwave Oven

1 Answer

Everything works exept the heat. Thought we had a power surge a few days ago?


To allow us to help you effectively (at no charge), please post a NEW problem to FixYa, and please include your brand name and the full model number from the tag in or on the unit, your symptoms, as well as the answers to these questions:

- When you try to microwave are the inside light, internal cooling fan and turntable all working?

- Is there any unusual noise or is it louder or quieter than normal?

(A loud buzz, hum, or groan is usually a shorted high voltage rectifier diode, but a sound like gurgling into an empty coffee mug is one symptom of a failed magnetron, and yet the mag can be bad without that sound.)

We have a sound clip here of what a microwave should sound like when the cooling fan and high voltage section are working.

Note that a
full Sears/Kenmore model number has 3 digits, a dot, then 8 more digits, such as ###.########

Nov 23, 2009 | Kenmore 80593 Microwave Oven

1 Answer

When turn on loud hum


Hi, this will happen when the motor become unstable. unfortunately, it isn't a failed component and, the motor will continue to operate in this situation with no defects. its just poor ,manufacturing within the motor design. you can purchase another motor and it will kill the hum.

May 22, 2009 | Kenmore 80012 Microwave Oven

1 Answer

Whirlpool Microwave


I would suspect the high-voltage transformer in this case, but the capacitor may be failing.

The high voltage section uses and generates voltages that can be instantly lethal.

So I don't recommend that anyone work in this area unless he has either a lot of experience or at the minimum, a good understanding of the safety issues and procedures involved.

If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

Also, there should also be a very helpful "mini-manual" hidden inside the unit behind the control panel. It's very helpful when troubleshooting.

You can usually find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383

Here are some links you or a friend can use for test help, but read the safety warnings first:

http://www.gallawa.com/microtech/cap_test.html
http://www.gallawa.com/microtech/diode.html
http://www.gallawa.com/microtech/mag_test.html
http://www.gallawa.com/microtech/xformer.html

We're happy to help and we appreciate your thoughtful rating of our answer.

Feb 02, 2008 | Microwave Ovens

1 Answer

High pitched hum/buzz


By high-pitched, you mean it is not that same frequency as when it's cooking? Is the tone near or the same as the beep you hear when you press a key? Please post a little more information so we can help better.

Nov 27, 2006 | Kenmore 66469 / 66462 / 66464 Microwave...

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