Question about Panasonic NN-H504WF Microwave Oven

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My new microwave is completely dead

Panasonic model #NN-H614........I was diagnosing an electrical problem at the breaker panel with the neutral disconnected and momentarily I switched on the main breaker.  In the kitchen I heard a buzz and quickly disconnected power.  Trying to locate what happened I could smell something burnt through the side vent of the microwave. And I saw that it was dead, no display on the LCD.  The receptacle it was plugged into worked with other appliances, so, my question is, with the spike of voltage it got zapped with, probably 240 volts, what burned out?  Does this model have a fuse (I hope) that could have blown, or is it a transformer or a magnetron in your experience?  Thanks so much in advance for your evaluation!

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  • marksal May 24, 2009

    No, the breaker didn't trip.  Are you positive there is no fuse?  I found a fuse listed for a similar Panasonic model, NNH664WF at AMI Resources

  • Dan Todd May 11, 2010

    So when you turned the main breaker off and disconnected the neutral, and turned it back on, the breaker for the microwave didn't trip when you heard the buzzing sound?

    That breaker is supposed to trip when you have a dead short like that. There is no fuse inside the microwave. It sounds to me like the main power transformer is fried, especially if the 120v side won't even run the lights.



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Good day,
hope this link below will solve your problem.

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Posted on Jul 31, 2010


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Jul 16, 2009 | Panasonic NN-H504WF Microwave Oven

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Voltage in home down when start microwave

Either the outlet for the microwave is not on its own breaker (which it always should be) or there is a loose screw connection or oxidation in the circuit breaker panel.

If the bad connection is on the neutral wire, this can create a dangerous condition.

You should measure (or have a pro measure) your voltage in various outlet s in the home.

If you have low voltage on some and high on others, you have a faulty neutral.

This can be serious. It should be checked.

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

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