Question about Panasonic NN-H275 Microwave Oven

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Heating ceases after one second

The timer is set and we push start. The heating starts, turntable begins, all lights are on and time is correct. One second later the heating ceases. Help!

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  • Panasonic Master
  • 9,047 Answers

See if this describes what's happening:

  • Put in time, push start and unit runs for 2 seconds, relay clicks, unit goes off. Cook time on display goes off and clock time comes back. Bad upper interlock switch and charred connector
If so, see http://207.234.249.73/mwd/safety.txt http://207.234.249.73/mwd/disassembly.txt http://207.234.249.73/mwd/doorsw.txt

Otherwise, 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.

It may be a loose connection in the wiring between the inverter, magnetron, and/or control board, or maybe one of those components has failed.


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.

In Canada, you can find an authorized Panasonic servicer here.

If yours is not a Panasonic, please reply back with your brand and model number so we can help you.

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

Posted on May 31, 2010

Testimonial: "Thanks for the good response ... and warnings! Looks like we are shopping for a new microwave."

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If the timer counts down and nothing else happens, the secondary interlock switch is bad. This switch completes the cook circuit and this is why it doesn't run. You need an ohm meter to diagnose and find the right switch. Switch failure is caused by opening the door when it is in cook mode. Push the stop button first before opening the door and this failure will cease to occur. BE CAREFUL !!

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I believe that there are to fuses inside this unit. One feeds the electronic components and the other feeds the turntable and the magnitron. Un plug the unit and check both fuses, you might get away with this cheaply. Please let me know if this helps. P.S. if one of the fuses continues to blow its time to get rid of the unit, because if they go bad they get stronger and very dangerous. What normally would boil water at 3 minutes could change to 45 seconds. Be careful.

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The 'Clock, is Machanical just like an ordinary kitchen timer The reast of it is electronic, and at that age time for a new one.

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