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I wouldn't advise you to use it unless it stops when you actually hit the off button. if it stops when you hit the off button it would be OK to use but only an adult and somebody who knows that the microwave is faulty. it sounds like one of the door switches is bad. there can be anywhere from 2 to 4 switches on the door. Normally open and normally closed switches are used on the door so you must always make sure you get the correct switch you can check them with a meter but you must open the microwave up which I think I would leave to somebody who knows about Microwaves.
Your Unit has an inverter, when the unit stops running after 10-20 seconds it is having a problem with either the Magnetron or the inverter. Sometimes both. There is not an easy way to test the inverter, the mag can be tested for shortage to ground with an ohm meter and between the terminals to check the filament for continuity. But if both are bad it is cheaper to buy a new unit.
Judging from the model and without looking it up I expect that unit has an inverter. If it is not the Switches and you have replaced the mag, the inverter is the power supply for the mag to work so either mag not getting power from inverter or inverter not getting signals from main PCB Timer board.
If it stops after 22 seconds, that means the controller has detected a problem, usually a problem with the inverter, controller, magnetron, or a bad connection from one or the other.
Due to the lethal voltages used and produced in inverters, I do not recommend that an inexperienced person work on these.
You can find an authorized Panasonic servicer here: Support Panasonic
My panasonic microwave model # NN-S540BFW stops after 4 seconds after you hit the start button and cuts off on its own. What is wrong with my microwave?
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.
Due to the lethal voltages used and produced, I do not recommend that an inexperienced person work on these inverter-based models.
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