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Panasonic Model NN T964SF inverter microwave runs for less than 5 seconds and shuts off. Power control function does not work either. Pressing power control a number overrides cook time with power control number. ie: 1 min. cook time followed by power control 5 = 5 second cook time at 100% power.

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  • Anonymous Dec 31, 2008

    I bought two Panasonic Inverter microwave ovens (both the same model number) within a month of each other about five years ago. They both stopped working within one week of each other! They both run for about 3 seconds and then shut down. I took one of them apart a few years ago because the timer circuit power transformer (on the circuit board) had a broken wire do to the front panel flexing when the keys were pressed. I fixed that problem by soldering in extensions to the tiny wires. Now this has happened and I'll bet it's the magnetron; probably cheaper to buy a new oven (in my case two new ovens) than replace a bad magnetron...

  • TrainSpotter Dec 31, 2008

    I bought two Panasonic Inverter microwave ovens within a month of each other about 5 years ago. They're identical, and were used equally. One of them stopped working completely a couple of years ago, and I traced that problem to a broken timer circuit power transformer lead. They fail because the transformer is mounted on the back of the keypad / circuit board, and when you press the keys and flex the pad the tiny lead wires break. I soldered extensions to them. Now one of the ovens started shutting down within 3 seconds last week, and the other one just failed exactly the same way! Panasonic must have planned obsolescence down to a science! This is a more expensive problem; probably the magnatron has failed, and they cost more than a new oven. (I won't buy Panasonic again...)

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  • Microwave Ovens Master
  • 8,871 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.

In most cases, this is 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.

I would recommend that you contact your nearest Panasonic-authorized servicer.

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

Posted on Aug 02, 2008

  • Rose
    Rose May 13, 2014

    I am experiencing this problem. Considering that the nearest authorized servicer is over 40 miles away, would it be worth the time and cost to attempt repair?

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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.


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

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