Question about Samsung SMH7178STD Microwave Oven

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Deep humming sound

I have a 2 year old Samsung over the range. It heats fine but gives a deep humming.(like someone blowing a horn) when it starts and even in the middle. I have tried rebooting it. Becomes ok for a short while and then starts again Why is it haapening?

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  • Samsung Master
  • 9,030 Answers

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.

Posted on Jun 08, 2008

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At our site, we have a video showing how to remove a typical over the range control panel assembly in under 5 minutes.

Here are some links you or someone you know can use (in order given) for test help, but read the safety warnings first:

http://www.gallawa.com/microtech/diode.html (if it is NOT shorted, it's probably fine)
http://www.gallawa.com/microtech/mag_test.html
http://www.gallawa.com/microtech/xformer.html

You can order Samsung parts here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

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Here are some links you or someone you know can use (in order given) for test help, but read the safety warnings first:

http://www.gallawa.com/microtech/diode.html
http://www.gallawa.com/microtech/mag_test.html

You can order Samsung parts here.

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.

Some manufacturers will send you the magnetron to do it yourself. If nothing else, you can save about $75 by taking it to the shop yourself.

You can find your nearest Samsung-authorized service center here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

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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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