Question about KitchenAid Microwave Ovens

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Microwave makes a loud humming sound when turned on.

Model # fmv157gs serial #kgb1141137 fcc vg8eamo44kyy my problem is when you turn on the unit it makes a loud humming noise as if the motor was bad and the items placed inside does not heat up or get hot.

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Microwave ovens have a diode stack, usually made up of HV Diodes sometimes only 1, if there is 2 one will sit between the 2 connections on the hIgh Voltage Capacitor which sits at the back usually right hand side to the right of the transformer, WARNING: before doing anything, the Oven must be unplugged and the capacitor shorted to earth, unplug one side of the diode and using a multimeter check for short, it should read virtually open circuit, if there is a problem with it it will show a low reading regardless of the polarity of the probes, there is another diode that sits between the HV Capacitor and the oven case (earth) do the same with that, if either read low, replace, then using the multimeter and test between the two connections of the HV capacitor, if reading id low, replace, then check the connections on the Magnatron to earth, not to each other, read should be open circuit any reading, it needs tro be replaced. Hope that helps...Phil

Posted on May 19, 2009

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Good Morning Jim Cole, thank you for your post!

From what you are describing it sounds like it could be an issue within your control panel or door switch. I would recommend having a technician out to properly diagnose your Frigidaire microwave to avoid any unnecessary part purchases. I hope this is helpful. -Matt

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Microwave will not heat, but will turn on. Clock and Timer still work. Turntable turns. Making a loud humming noise and light flickers


This clearly indicates a bad magnetron, "heats food" in most cases it is cheaper to replace the microwave oven than have it repaired, since the magnetron is the heart of the unit.

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The humming can be caused by a couple of bad parts. Usually it's the magnetron tube, the microwave source. They often fail by shorting out, and the loud hum from the power supply is what you hear. Another part called the HV diode may also have shorted, but the magnetron is more common.

A bad magnetron can be replaced, but it's a costly part. And microwave service should be left to a professional, because there are dangerous voltages under the cover and a chance of microwave leakage if repairs aren't done correctly. Between the part and labor costs, it might be more economical to replace the oven. Let a qualified servicer give you a repair estimate and then decide.

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Runs normally, but makes loud hum. not heating. in defrost mode, loud hum, then normal sounds, then loud hum, then normal...


Hi,


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

Basic Microwave Oven Troubleshooting Tips

heatman101

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The unit is 3 years old and when I turn it on there is a loud hum. Theunit also does not heat but turns the turntable?


From your description it sounds like the magnetron has failed in this oven. That's the part the makes the microwaves to heat the food. It typically fails by shorting out and making a loud hum noise. It not usually worth fixing since the price of a replacement magnetron is almost as much as a new oven.

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It sounds like a failing magnetron. Sometimes they can be intermittent before they finally fail for good.

Chances are your oven has a 5-10 year warranty on the magnetron.

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 detailed symptoms.

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.

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the magnetron the unit has gone bad.sometimes there is burning smell as u mentioned.it is little expensive repair arond $ 150.00.find out the price of new unit plus iistallation/delivery chg and then make a decision.

Aug 17, 2009 | Microwave Ovens

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Oven does not heat and makes loud, continuous "hum" when turned on and related to turning of oven table.


est the high voltage capacitor,the rectifier diode.or the magnetron. If all this are fine, test the control board.

Thediode and capacitors can br tested. The capacitor must bealloweddischarge before testing, or you risk to get electrocuted, evenifpower is off. Capacitors can get discharged by shorting theirtwocontacts.
Before replacing the magnetron test also the control board.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.



All locations, and description of this parts can be located using the diagram here: Counter top.

Parts must be tested to find out what is wrong.

Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.

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Microwave made a loud pop,won't heat,sounds like it's only on half power, makes a low intermittent hum


This is almost certainly a blown high voltage diode.

Please reply back with your brand and model number so we can help you.

May 31, 2008 | Microwave Ovens

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Maytag Rangehood Microwave Loud Humming


Sounds like you just fried your magnetron. Normally when they go bad, they make a very loud noise like what you described. The smell concerns me because you may have ruined the waveguide as well. If the magnetron burns through the protective painted surface of the waveguide, the waveguide is ruined. In most microwave ovens this means replacing the entire unit because the waveguide is not replaceable. Putting a new magnetron in a damaged waveguide will result in the same arcing and eventual failure. In addition to the magnetron, the following components are part of the same high voltage network: HV Transformer HV Diode HV Capacitor Magnetron Thermal Cut-Out Any one of these components could have also been damaged. I DO NOT recommend taking any voltage measurements inside the HV network. Potentials of over 4000 volts can be reached and make it very dangerous for the do-it-yourselfer. Taking resistance readings with the unit unplugged is strongly encouraged. If you decide to pursue a repair, inspect the magnetron tip and inside of the waveguide first. If the magnetron is melted and/or there are burn marks inside the waveguide, a new microwave may be a in order. This actually may be a better option than an expensive repair. I hope you find this advice helpful.

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