Question about Panasonic NN-S553 1350 Watts Microwave Oven

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MW stops after 23 seconds.

Sir, On any power level the unit turns off after 23 seconds. There is no heat and I can restart it as soon as it stops. The fans and turntable work fine. I do not think the door switches are the problem since "the diplay clears and returns to clock mode" like it is finished cooking. When this occurs ther is no beeping like it was done. I checked the switches with a Fluke and they are working fine. Normally if the MW is stopped the cook time remains on the display. There are no strange noises or odors. I hope this enough info for you go on. Thanks Jay Johnson

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  • jay johnson May 11, 2007

    Okay, just checked the magnatron 0.1-0.2 Ohms across the terminals but only 400 Ohms to ground. I don't think 400 is a good number. If I am correct it should be at least >1M.

    I'll check the relays and connections again but I think I need at least a new magnatron.

    Thanks for the ideas, back to troubleshooting

  • Anonymous Mar 22, 2014

    after finishing cooking and opening door, power doesn't always turn off. Have to unplug microwave about 20% of the time.

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There is a thermal cut-out on the magnetron - check not open circuit

Posted on May 09, 2007

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PLESE CHECK RELAYS ON PCBOARD .ALSO TRY DISCONNECTING ALL CONNECTIONS TO FRONT PANEL LEAVE IT DISCONNECTED 5MIN THEN RECONNECT AND TRY THE ELECTRONICS SHOULD RESET .HOPE I HELPED BIT OF A WEIRD FAULT

Posted on May 09, 2007

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Sorry to read about your problem, I hope this helps you out.


Display: This is used to show the time, cook time and options you chose during you use.
Cook: Use this feature to cook fresh vegetable, frozen vegetables, rice and cassroles.
Enter/Start: This is used to start and enter any option you choice while operating the unit.
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Less: This is used to decrease the cooking time by ten second intervals. If you want to decrease time without restarting the time press this to decrease cooking time in ten second intervals.


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Power Level: This is use to choose the power level in which to cook or heat food or beverages. To change the default setting of 100%, press the power level button and press the level you desire, if you desire only 50% then press power level the 5 and enter/start. Hint: Change the Power level before entering the time your setting to cook
EZ-ON: This is to quickly start the power level to 100%.
Vent High/Low/Off: This is to turn the vent located on the outside of the unit during use. You have the option of turning it off, on, high or low.
Light High/Low/Off: This controls the light on the bottom of the unit if you have a mounted range above your stove or under your top counter cabinets.
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