Question about Whirlpool MT1110SKQ 1100 Watts Microwave Oven

1 Answer

Makes a loud humming noise while operating

It began making a loud humming noise (louder than normal) Seems to operate fine, but is not heating. Is it dead??

Posted by apirotina on

  • Anonymous Mar 26, 2014

    turns on but has a loud hum and food does not heat

  • Anonymous Mar 26, 2014

    control panel is working as normal

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1 Answer

Dave Harris

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Almost certainly, the component called the "magnetron" has died. This is the valve (tube in the US) which actually generates the microwaves. The loud humming is the transformer that supplies the magnetron being overloaded and/or the magnetron itself. If the rest of the appliance is OK and not too old, the magnetron can be replaced. If you aren't familiar with these appliances, you *must* get this done by someone who understands the dangers of messing with them - if you get it wrong, they can bite! In some countries, only qualified engineers can buy the spare parts. In the UK, the part costs around £40 - £80, depending on the model. If the appliance is more than around three years old, it may be a false economy to repair it as other parts may fail soon after the repair.

Posted on Sep 24, 2007

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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.
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GE microwave occasionally buzzes loudly.

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.
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Makes a really loud buzzing noise during operation

Unit uses a Magnetron and likely a power board called an inverter to run it. Someone would have to open the unit in a way where they might pinpoint where the sound is coming from and then take action--does not of course sound normal or good to me.
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My JES636WK01 microwave heats up but it makes a loud humming noise. I suspected the Magnetron and disconnected it. The microwave was then operated and the n oiuse was the same. Do you have any ideas

Disconnect the HV transformer leads from the magnetron and the capacitor. Make sure none of the wires are touching the chasis or other parts. If the loud humming sound is still present, it is the High Voltage transformer making the noise. If the noise goes away, it is the High Voltage Capacitor going bad.

*MAKE SURE TO UNPLUG UNIT BEFORE TOUCHING ANY OF THE HIGH VOLTAGE LEADS! ALSO, DISCHARGE THE CAPACITOR BY SHORTING THE TWO SIDES AGAINST EACH OTHER!
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KEY PAD SEEMS FINE BUT WHEN YOU HIT START UNIT MAKES LOUDER THAN NORMAL HUMMING NOISE AND UNIT DOESN'T HEAT ANYMORE

The magnetron has failed or the high voltage transformer is the problem, either way! it is very expensive to replace, cheaper to buy new.
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I have a model GE JVM1653BD 001 microwave. Sometimes when it runs it makes a loud growling sound. It appears to be heating normally though. Intermittantly makes this noise.

I have the same model ending in 003, and it has made this noise for most of its life of several years now. Every now and again it runs quietly.

My theory is the cooling fan (not the hood fan) is making noise. The problem began within the first year of operation, and up till now everything is in good working order otherwise. There is no odor of failing parts.

My installation book has no electrical circuit diagrams, and I came upon your question when searching the topic.
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HI. I have a Whirlpool Microwave (MH6141XKB). It will not reheat the food and makes a louder "humming" sound than normal. Other than that, everything works fine. Please advise. Brent

Brent
The magnatron in your oven has gone out and will need replaced!( This is the device that heats up your food) If everything is working and your food is not getting hot 99.9 percent of the time its the Magnatron or its fuse! The loud humming is also a big clue the MAGNATRON has gone bad!
Please rate this response and help us keep this area free!
Thank You!
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GE JVM1440BD Won't Heat

If it making a louder than normal humming or grunting sound when operating, than it's a sure bet it's the MAG.
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