Question about Emerson MW8779W Microwave Oven

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Loud RATTLE LIKE HUMM!!

Everything works, just that distracting HUM!! No food deposit !! Oven is clean! screws are tight!!

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  • dutton May 26, 2009

    Azgene36, No that is NOT my problem! Thanks for the try!

    Dutton

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  • 63 Answers

That's what they do - plenty of focused energy at work here. However, try removing the rotating food tray and, with just a glass of water in the oven (never run it empty!) see if the hum goes away. If so, it's the tray driver/carrier.

Posted on May 26, 2009

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1 Answer

Makes loud hum noise but does heat


That is a symptom that the magnetron circuit has failed. It the part that generates the microwaves that heat the food. Not worth fixing since the replacement part can cost as much as as a new oven. Sorry.

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Aug 15, 2010 | KitchenAid KCMS1555RSS Stainless Steel...

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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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Microwave won't turn on


When you say that the microwave won't turn on, can I assume that you mean that the food does not heat up! If that is the case, the problem lies with the magnetron circuit. This circuit consists of the transformer, rectifier and the magnetron, the part that generates the microwaves to heat the food. If it is the magenetron, then it probally not worth fixing since the cost to purchase the magnetron is almost as much as a new oven. To diagnose if it is the magnetron that has failed, when you turn on the oven, do you hear a louder that normal hum or buzzing sound? If that is the case, then it means that the magnetron is shorted and needs to be replaced.

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Doesn't heat up food


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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 | General Electric Microwave Oven

1 Answer

My microwave makes a loud humm when turned on and does not heat the food. If I put in another mode, Meat, it sounds normal but after a mmin it starts to make the same humm. ???


You most likely have a bad high voltage diode. (Item F1 of link but labeled rectifier)

http://www.appliancepartspros.com/partsearch/model.aspx?model_id=5154395


However... there are two other possibilties those being the High Voltage Capacitor (F2 of link above)
and the Magnetron istelf. (F7 of the link above)

More often than not the diode / rectifier is the problem.

Thanks for using FixYa.

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Mar 19, 2010 | Frigidaire PLMV169DC Microwave Oven

1 Answer

Food will not heat everything else is working


If it does not heat, with all other functions working, the problem lies with the magnetron circuit. The magnetron is the part that makes the microwaves to heat the food. Typically, the magnetron fails and shorts out. Symptoms when this occurs is a loud hum from the oven and does not heat the food. The replacement magnetron costs are close to the price of a new microwave oven, so it rarely pays to have it fixed.

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I have a 2001 GE Spacemaker #JVM1840CD001 that does not heat anything, but runs. What's wrong and how can I fix it?


If your microwave oven "works" meaning that your display, cooking tray rotates, and the light turns on when you open the door, but does not heat the food, the problem usually is with the magnetron circuit. If you hear a loud hum when you try to heat something in the oven usually means that the magnetron has failed. The replacement magetron is about the same price as a new oven, so you are better off buying a new oven.

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The oven sparks and gives a loud hum during use with plastic food containers. This scares my wife and mom terribly. I have an Emerson 900W microwave oven (model:MW8999SB).


It seems as though the container has a small amount of metal embedded in it ... don't assume just because it is plastic you can put it in the microwave.
Tip ... put just the plastic container in empty and try it. If the plastic get hot then it's the wrong type plastic for a microwave

Oct 02, 2009 | Microwave Ovens

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