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.
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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...
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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