Question about Microwave Ovens

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Oven operating while empty

Mistakenly put oven on with nothing in it. It ran for about twenty minutes before I realized it. Yet it seems to work fine now. Also, previous to this mistake, at another time, the oven had burning smell while in use. Is it still safe to use it? thank you

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  • Microwave Ovens Master
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Yes, as long as you don't smell any burning, but as always, no microwave should ever run unattended.

Posted on Jun 03, 2009

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Posted on Jan 02, 2017

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2 Answers

Our LG over the stove microwave oven LMHM2017ST is powerless.


Probably burned up the magnetron. You are cautioned not to operate the oven empty.

Jul 27, 2017 | LG Microwave Ovens

1 Answer

Why can't you run a microwave without anything in it? What happens and can you fix the problem? I forgot to put the food in and ran it for 4 minutes with nothing inside. Now it won't heat any food.


A microwave oven works on the principal of a high power high frequency radio transmitter. The device that emits the microwave energy is a tube called a magnetron . When you run the microwave empty with nothing to absorb the microwave energy it is all reflected back to the magnetron causing it to overheat and destroy itself or cause failure in the High Voltage power supply due to excessive current draw.This is caused by standing waves.

Aug 08, 2014 | GE Spacemaker JVM1740 Microwave Oven

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Microwave does not heat. used as timer and has not worked since


If you ran this unit empty on full power as a timer, it burned out the magnetron. You have to have a load in a microwave or else there is nothing for the energy to work on so it backs up and destroys itself. It's like putting a potato in a tail pipe..... only worse....

Nov 03, 2013 | Goldstar MV-1501 Microwave Oven

1 Answer

Ran the microwave with nothing inside. Now microwave is not working.


When you say it's not working do you mean it is completely dead??? or it turns on but it don't heat??
When running an empty microwave it can damage the MAGNETRON because the inside coating of the microwave is design to bounce (reflect) the waves to whatever is sitting in the bottom/middle (food)... if nothing is there to ABSORB the waves, than it bounces back into the MAGNETRON and can damage it (if it runs long enough)... the magnetron is generally more expensive to replace than the oven it self... so to make sure if the magnetron is working, you could try a test with a HENE lamp (small orange neon bulb) in a glass of water, put the bulb in a full glass of water than put the glass in the oven, start the oven, if you see the bulb glowing orange (lights up) it means that the MAGNETRON is working, if not than you need a new oven...

Good luck!

Mar 20, 2011 | Maytag Microwave Ovens

1 Answer

GE Spacemaker Microwave not working


Hopefully not!. Microwaves have a failsafe circuit built in that when they overheat they shut dowen for about 3/4 hr in severe cases and then reset themselves.
By now it has probably come back on line.

Please rate my help++++Thankis for using FIXYA

Jun 12, 2010 | Microwave Ovens

2 Answers

Unit is dead after accidentally running it empty.


If you ran it for that long with nothing inside, there is a good chance it self cooked.

It can probably be repaired. The economics of the repair is something you will have to judge for yourself.

To assist you, may i suggest you visit www.repairclinic.com and check on some major parts for your make and model. If the parts = more than 25% of replacement, I think id be moving on. Expect to pay a pro at least $100.00/hr labor. You should NOT do it unless you are skilled at handling delicate and lethal electronics. A microwave can kill. Another thing, after you fix it, you have a lot of $ invested and still have a old machine that ran for 13 + minutes empty.

Oct 13, 2009 | Microwave Ovens

1 Answer

Kenmore 401.8008700 ran 10 minutes thought I'd set on timer


It could be the fuse. You will also need to check the condition and alignment of the door switches.
Eric

Jul 15, 2009 | Whirlpool GH6177XP Microwave Oven

2 Answers

Microwave was ran for 5 minutes with nothin in it now no display


most have an internal fuse check it first if that is not it check the thermal fuse both parts run 10-15 dollars

Jun 30, 2009 | Maytag MMV4205 Microwave Oven

1 Answer

Oven won't function after 5 minutes of cook time with nothing in


It's posible that since it was running empty, the magnetron overheated and a thermal cutout or thermostat located on the magnetron opened.

Magnetrons may be protected by a thermostat, which will reset when it cools, or a thermal fuse, which is a one-time use device. It is also possible that in some cases, a thermostat will fail when opened.

In the worst case the magnetron may be damaged due to running empty.

I hope this will solve your issue.

Good Luck.

If my solution proves useful please accept it.

Regards
Arjun

Apr 07, 2009 | LG LMV1630 Convection/Microwave Oven

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