Question about Whirlpool GH8155XM Microwave Oven

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GE Microwave does not heat and makes loud buzzing noise.

I have GE model # JVM1660WB. I had the same problen about 1-2 years ago, and replaced the magnitron, diode, and stir plate which all came in a kit. Worked fine until now. This time I replaced with same kit and it only worked one time when I tested with a cup of water. Next day when reheating leftovers, it started buzzing and not heating again. I believe both diodes are shorted, but think the mags are good. What is causing the diodes to short? Also the fuses do not blow like some of the other problems I have seen on this site.

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  • Gus May 11, 2010

    If you are blowing diodes, you have a High voltage issue. Basically inverter or transformer is operating without any connected output. Suggest you continuity test the capacitor if fitted also the magnetron for any resistance to casing. This will highlight any potential shorts.

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I have just replaced the magnatrton for a Kenmore microwave model # 665.606.5900 as before replacing the part there is still the buzzing sound and non-heating

Posted on Jul 20, 2013

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cactus bob
  • 267 Answers

SOURCE: HV diode producing resistance of 10 ohms.

you cannot check a microwave diode with just a mutli meter . you have to make a test jig take a 9 volt battery and a meter with dc volt scale set up the meter just like you would test a 9v battery .with me so far ? now remove one lead from the battery and insert the diode between the battery and the test lead .......take a reading . now reverse the diode take a reading ........ i just tested a diode before writeing this and this is what i got my battey volts where 9.2 v whith the diode inserted i got 7volts . reversing it i got .02 volts dc . a diode is a one way valve and mine is good because it passed curent only one way ...yours should be about the same ....... if you understand this please leave me 4 stars ! i even went out in the shop and tested a diode for you just to make sure my answer was correct

Posted on Mar 07, 2009

MicrowaveSvc
  • 8820 Answers

SOURCE: JVM1650SH02 keeps shorting out after a couple seconds

> but he would also replace the capacitor and diod when replacing the mag tube

Most of the time replacxing them all is done due to ignorance about how to actually test devices, a mistaken notion that it's somehow necessary, or to pad the bill.

The diode may be necessary in some cases (if it tests bad) but the capacitor is almost certainly not needed.

When a capacitor fails, it almost always shorts. If so, the fuse would blow when you peress "Start" to begin cooking.

I've rarely (if ever) seen one fail without shorting.

If it's within the magnetron portion of the warranty (usually 5-9 years) but out of the original full warranty (usually 1 year), then GE manufacturer will cover the part cost, but not the cost to visit you or the labor charge to do the work.

If you're doing this yourself, G.E. will send you the magnetron to do it yourself. Call them at 888-239-6832.

Be persistent. You may have to speak with a supervisor.


You can find helpful exploded view diagrams and order parts by entering your full model number from the tag on the oven here.

> Can I just replace the mag tube without also replacing the diod and capacitor?

Almost certainly.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

William E. Miller
prototech@usa.net
http://www.microwavedisplay.com

Posted on Sep 11, 2009

  • 670 Answers

SOURCE: My microwave is making a humming noise but not

The part that you did not replace is the problem with the oven, the magnetron. It typically fails and shorts out, causing the oven to make a loud humming noise. Not worth fixing since the cost of the magnetron is typically as much as a new oven. Sorry that you spent your time an money replacing the wrong parts.

Posted on Jul 14, 2010

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see this causes and fix it. God bless you
Magnetron If the microwave is loud or noisy only when cooking, the magnetron tube might be defective. The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. Under normal circumstances the magnetron is nearly silent. However if it is damaged or nearly burned out it can begin emitting high pitched or growling noises. It's not normally dangerous to use a microwave oven when it makes these noises, but they are an indication that the magnetron is almost dead and will need to be replaced.
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Sounds like the magnetron circuit has failed. It is the part that generates the microwaves that heat the food. It often shorts out, and makes a loud humming or buzzing noise when it fails. It's not usually cost effect to replace since the part alone can cost as much as a new oven.

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Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

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Contact them at http://www.geappliances.com/service_and_support/contact/

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

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

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