Question about Panasonic NN-S542 Microwave Oven

1 Answer

Shuts off but everything else works

When I hit the start button the microwave comes on. I also hear a buzzing noise that ticks like a clock while its running. Then suddenly it stops working. Sometimes it will run for 30 seconds. Other times it will only run for 2-3 seconds.

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  • Anonymous Nov 30, 2008

    Our unit runs for 3 seconds and then shuts off. It will do this most of the time but once in awhile it works just fine.

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  • Panasonic Master
  • 9,047 Answers

If the digital programmer circuit / controller does not get a feedback signal from the inverter for a period of 3 seconds, the controller will stop the cook cycle.

If it stops after 22 seconds, that means the controller has detected a problem, usually a problem with the inverter or a bad magnetron.

Due to the lethal voltages used and produced, I do not recommend that an inexperienced person work on these.

You can find an authorized Panasonic servicer here.

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

Posted on Nov 08, 2008

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Investigate these three areas if your microwave won't heat but you hear a loud buzzing or humming noise:
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A diode is an electronic component that readily passes current in one direction only and blocks the flow of current in the opposing direction. If your microwave's diode has become defective, your microwave will not heat and you will hear a buzzing noise. Test the diode to determine if this is the cause of your problem. Replace it if it is defective.

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A capacitor is an electrical device which stores electricity. A defective capacitor may be why your microwave is not heating but you are hearing a buzzing or humming noise. The capacitor will have to be tested to determine if this is the cause of your problem. A defective capacitor will have to be replaced before your microwave will work again. Make sure you discharge the capacitor before you test it, though.

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William E. Miller, AS-EET
prototech@usa.net
http://www.microwavedisplay.com

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