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Microwave does not heat. Strange noise coming from motor. Everything seems to be working but does not heat food at all. Loud buzz or hum coming from unit.

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  • Anonymous Mar 24, 2014

    Everything else seems to work, like the dish rotates, etc.

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You may have either a bad filament transformer or a bad magnetron tube.. and if you are referring to a table top model .....then the cost to repair may be more than the cost to replace.. so consider that into your decision.. Table top microwaves are relatively inexpensive now..

If you are referring to an over the stove combination micro/vent system then you may want to get it repaired by a certified appliance technician. There is high voltage inside the electronics compartment and by opening the cabinet, you may not reassemble it correctly and compromise the shielding in which case you may be exposing family members to microwave energy... Not good..
Hope this helps..

Posted on Sep 18, 2008

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1 Answer

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.

Nov 14, 2013 | Jenn-Air JMV8208AAS Microwave Oven

1 Answer

Buzzing noise


follow this steps 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 t
urntable motor. This is a relatively easy repair and will put an end to the noise once replaced.

Oct 23, 2013 | Panasonic Microwave Ovens

1 Answer

Wont heat. Everything else seems to work. I notice a HUMMING noise while it is opperatiing


A loud humming or buzzing noise would indicate a short on the magnetron circuit, the part that heats the food. These can be expensive to repair since the cost of the magnetron can be as much as a new oven. Get a few estimates before deciding whether to repair or replace.

Dec 07, 2010 | Whirlpool GH4155XP Microwave Oven

1 Answer

I press #1 and hit start the blower works and light comes on but no heat


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.

Dec 06, 2010 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Microwave comes on but not heat item


It's most likely the magnetron that has failed if it does not heat the food. The magnetron is the part the generates the microwaves. When it fails, it typically shorts out, and makes a loud hum or buzzing noise. If this is the case, it is not worth fixing since the cost of the magnetron is almost as much as getting a new oven. Sorry.

Jul 02, 2010 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Everything works but it doesn't heat up the food. What could it be?


The part that generates microwaves that heat the food is the magnetron. Typically when the magnetron fails, it shorts out. When that happens the oven will produce a loud buzzing or humming sound. It typically not worth the cost to replace the magnetron, because it is almost as much as buying a new oven.

Jul 01, 2010 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Loud buzzing noise with Whirpool microwave oven when it comes on. All lights, heating and fan seems to work but not sure why loud buzzing. What is the problem?


The loud buzzing you hear is the sound of the magnatron tube.That is what emits the microwave radiation and buzzing should be normal. The mag tube may be nearing its end at witch time you will hear no buzzing and hence no heating of foods. Replacement can be costly depending on the model so most people just opt for a new one. Hope this helps

Jul 30, 2009 | Microwave Ovens

1 Answer

Noisy when running - not the usual humming noise


check turntable motor or bush, this very easy problem, you can use oven no problem..

Nov 11, 2007 | Whirlpool GH8155XJ Microwave Oven

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