Question about Samsung Microwave Ovens

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My microwave stops goes dead after running for 2 minutes

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  • Samsung Master
  • 9,098 Answers

It may be that the magnetron is overheating. The main causes:

- blocked air vents
- blocked air outlet or duct (if an over the range type)
- clogged grease filters needing to be cleaned
- clogged charcoal filter needing to be replaced
- failed internal cooling fan
- failing magnetron

Depending on the model, it may have a thermostat on the magnetron so that the power is killed if it overheats, then it comes back on when it cools down.

We have a sound clip of what a microwave should sound like when the cooling fan and high voltage section are operating here.

Please listen to that and compare it to yours. You may hear that your cooling fan is not running.

When I say internal cooling fan, I do not mean the hood vent exhaust fan which you can turn on and off manually.

I'm instead talking about the internal fan which comes on automatically whenever you microwave.

It is vital that the cooling fan runs, or the turntable and stirrer won't work, and magnetron will soon be destroyed.

If instead the microwave starts microwaving then it scrambles and then comes back up as if someone unplugged it for a couple of seconds and you can set the clock and start again, then you have a magnetron that is leaky.

Once you listen to that and check your vents, filters, etc., let us know what you find so we can take it from there.

Please note that FixYa is not currently notifying us Experts when Clarification Requests are answered.

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NEW problem to FixYa, and please include your brand name and the full model number from the tag in or on the unit, and your detailed symptoms, as well as the results of these recommended checks.

Posted on Dec 13, 2009

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Posted on Jan 02, 2017

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WhIzAtIt
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SOURCE: Clock will run down to 1 second of the minute and microwave will stop

Yes the timer is prob the culprit. You probably had a brown out that caused the whole thing to go haywire.

Posted on Sep 21, 2007

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The thermal cutout on either the magnetron or cavity might be opening. Sometimes these cutouts become defective and open at too low of a temperature. Or, you might have an air flow obstruction to the magnetron, or cooling fan problem.

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This sounds like a thermal protector is turning the microwave off. If I were to hazard a guess, it would be the magnetron (produces the microwaves) is overheating causing the shutdown. If the fan was not running it would create the same condition by causing the magnetron to overheat.

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Sounds like a 'thermal' protect switch is activating after running. Make sure that (if the unit is mounted in a cabinet) that there is sufficient space around the unit for proper air flow and that nothing is blocking the vents. Try setting it on a counter top and heat something. If it works properly and doesn't shut off, the venting space is the problem. You may have to have the cabinet that it sits in redesigned for more clearance.

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When you say shuts off, do you mean it goes dead as if someone unplugged it, or does it stop as if someone hit the Stop pad?

If it is going dead, it sounds like the magnetron is overheating and opening the thermostat.

This can be caused when the internal cooling fan is not running or by a magnetron that is failing.

When I say internal cooling fan, I do not mean the hood vent exhaust fan which you can turn on and off manually.

I'm instead talking about the internal fan which comes on automatically whenever you microwave.

It is vital that the cooling fan runs, or the magnetron will be destroyed.

If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa.

You can usually find helpful exploded view diagrams and order parts by entering your full model number here.

There should also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.

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

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If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open.

Then when it cools, it closes the circuit and allows power through again.

First of all, be sure the internal cooling fan is running. That's critical to protect the magnetron by keeping it cool.

You can test this by running the microwave with a cup of water inside. First, cook for about 2 minutes on the lowest power setting and see if it makes it to the end. Then cook on high for 2 minutes and see if it makes it to the end.

If the defrost test works, but the full power test does not, then the magnetron is overheating.

If you or someone you know wants to look into this, we have critical safety, disassembly, and troubleshooting info at our site, and our link is at our listing here on FixYa.

You can usually find helpful exploded view diagrams and order parts by entering your full model number here.

There should also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.

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

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