Question about Whirlpool MH3184XP Microwave Oven

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Humming sound when off

My microwave is a 1-1/2 years old and yesterday I noticed a humming sound coming from the microwave when it was off. I unplugged it and it stopped, however, when I plugged it in the humming returned. It works fine but the noise scares me, could be a fire hazard.

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  • Anonymous Sep 21, 2008

    I also have a Whirlpool microwave. We had the same experience. Just one night it started humming and it was off. We couldn't get it to stop unless we unplugged it. The next morning we plugged it back in and haven't heard the noise since, but it is a concern to us as well. Our microwave is also 1 1/2 years old.

  • Anonymous Mar 27, 2014

    Low humming sound.goes away when unplugged, but returns when unit is plugged back in.GE Advantium, manufactured 2007

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I also have the same microwave model and with the same problem. It is not quite 2 years old. I have a service call scheduled but did e-mail customer service at Whirlpool to inform them of this. Sounds like it could be defective model and a fire hazard. You should also inform them of yours.

Posted on May 16, 2008

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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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1) Failed controller board (unlikely if you are getting a clock readout and you can get the various functions to work, just no heat)
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Door switches insure the microwave circuit will not engage when the door is open. Slamming the door of the microwave is hard on the switch.

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The diode is a relatively inexpensive part, and is not easily tested. If a grumble is heard coming from electrical area of the unit, then the diode could be shorted.

A shorted capacitor will blow the fuse immediately. And open capacitor will cause a "no heat" condition.

A bad magnetron will also cause a low level hum or grumble from the transformer. But is may also cause no other identifiable symptom of failure.

A bad transformer will exhibit a grumble or hum, and may or may not blow the fuse. But be careful here, the secondary of the transformer produces very high voltages, up to 2.5Kv. Few people own a meter capable of measuring such voltages.

Service and repair of microwave ovens is dangerous work. If you don't know what your doing, DO NOT ATTEMPT TO SERVICE A UNIT WITHOUT INSTRUCTION.

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I would say your magnetron has failed.

If it's within the magnetron portion of the warranty (usually 5-9 years) but out of the original full warranty (usually 1 year), then your manufacturer will cover the part cost, but not the cost to visit you or the labor charge to do the work.

If it's within the one-year time frame, the repairs should be free.

We're happy to help and we appreciate your thoughtful rating of our answer.

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This usually means the magnetron is failing.

Just be sure the internal cooling fan is working by making sure you feel air flow. If not, call for service right away.

The magnetron part cost is covered beyond the normal 1-year warranty, so when it gets worse or stops heating, you'll have to call for service.

To find an authorized Samsung servicer, look here.

We're happy to help and we appreciate your thoughtful rating of our answer.

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hi,

You may need a new magnetron, contact sharp or the store you got it from; most microwaves have a 3-5 year warranty on the magnetron. If it's not in warranty, find a good appliance repairman, this is a difficult and dangerous repair job.

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