Question about Whirlpool MH7140XF Microwave Oven

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Microwave won't heat/Makes buzzing noise.

When try to use the microwave, it makes a loud buzzing noise and it doesn't heat. i just tried it again and let it run for 1 minute. It doesn't heat and it smelled like something was starting to melt.

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  • 2VCRSDAD Jun 22, 2008

    Exact same problem as Crunyan's microwave, Except I have a GE JVM1640 Spacesaver. No heat, but everything else seems to work ok. It has been only 8 months since I paid a $115 for a GE service repairperson to replace an $18 part! If I can't repair it myself this time, I am just going to buy another microwave - but not a GE! Any advice?

  • 2003Pilot Jan 23, 2009

    Hi jsrock516


    I have the same problem on my GE Spacemaker XL model JVM 1350.


    If you think it is the Magnetron, I want to replace it myself.  Is this difficult?


    I'm aware of high voltafes in capacitors, and in the Magnetron itself, and will ground out them before I replace the tube.


    What is the number of the Magnetron?


    Thanks  Gary in Hillsborough NJ

  • macarr Mar 27, 2009

    My microwave is making the same type of noise. It is a loud buzzing type of noise. Then I can smell something also. We bought it in 2000. I thought it should last longer than this.

  • Anonymous Mar 25, 2014

    everything is working

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  • 5,911 Answers

The symptoms you are describing are typical of a magnetron that has gone bad. Continuing to attempt to use the oven in its current condition can cause further damage. So, I would recommend not using it. Microwave ovens are considered dangerous and repairs should not be attempted by anyone that is not electronic saavy. The High Voltage Network inside the oven has voltage potentials of 14,000 volts and higher. If you feel this is something you wish to attempt, the Magnetron part number is 1156751 and costs approx. $158. Keep in mind, if the magnetron has been arcing and making a burning smell you may have burned the protective coating that lines the walls of the waveguide. If the waveguide is damaged it is not repairable. I do not know if this is a replaceable item on your model microwave. Double check your warranty information and/or owner's manual. In many cases the magnetron is warranted for several years beyond the limited warranty that comes with most appliances. Post back with comments and let me know if you want me to assist you further. In addition, if you provide me with your EXACT model number (located along the door opening) I can narrow down parts a little better. I know this all sounds discouraging, but I do hope I have been able to help you.

Posted on Jan 15, 2008

  • Harry Brown
    Harry Brown Feb 04, 2015

    this describes my microwave - won't heat, loud humming noise, light and fan works. Model MH6141XKQ-1

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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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A diode is an electronic component that readily passes current in one direction only and blocks the flow of current in the opposing direction. If your microwave's diode has become defective, your microwave will not heat and you will hear a buzzing noise. Test the diode to determine if this is the cause of your problem. Replace it if it is defective.

picturena.gif High Voltage Capacitor

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