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Microwave works, new noise

1200W Panasonic Inverter model, 5 yo, heavy use, works fine, but has started making a 2-3 second buzzing sound during first 10 seconds of operation. Is it safe, and will it need replaced soon? Thanks!

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It could be a bad magnetron, or it may be mild arcing due to food particles or grease on or behind the waveguide cover.

No microwave should ever be left unattended while running.

Posted on Jul 01, 2008

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Panasonic inverter 900w microwave fault code h97


H95, H97, H98 or H99 mean that there's a problem with your inverter, magnetron, or digital programming circuit.

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.

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Unit uses a Magnetron and likely a power board called an inverter to run it. Someone would have to open the unit in a way where they might pinpoint where the sound is coming from and then take action--does not of course sound normal or good to me.

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Your microwave generation system has failed and Panasonic recommends that you get it serviced by a qualified tech. Hope it is under warranty!

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Microwave not heating


It most likely is either a issue with the inverter (power supply) or the Magnatron (main unit) in this oven.

It could be a thermal fuse inside but the noise sounds more like Inverter or Magnatron.

If not a cheap unit have a shop take a look and get an estimate.

Jun 15, 2012 | Amana Microwave Ovens

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There is a child lock on our Panasonic Inverter 1200w microwave, but don't know how to unlock it. Can you help me?


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Nov 03, 2009 | Microwave Ovens

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Panasonic Microwave NN-C980-B buzzing noise but it still works.


All:
I have a 2003 Sears Ultra Wave microwave 721.63682300 with a similar problem. A few months ago it started giving off short buzzes when turned on. That stopped but then I noticed that everything took twice as long to heat up. After quite a bit of teardown&inspection I found a circuit break in the inverter board leading to ZD704 diode (pictured). I will now try to find a replacement diode to see if replacing will fix it. Thanks for your postings.

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Feb 15, 2009 | Panasonic NN-C980 Convection/Microwave...

1 Answer

Panasonic Microwave only works for 37 secs no matter what time setting


If it stops after 22 seconds, that means the controller has detected a problem, usually a problem with the inverter or a bad magnetron.

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.

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

Jan 04, 2009 | Microwave Ovens

1 Answer

Shuts off but everything else works


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.

If it stops after 22 seconds, that means the controller has detected a problem, usually 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.

You can find an authorized Panasonic servicer here.

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

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Kenmore 721.63662300, 1200W


The magnatron is shorting and overloading the high voltage transformer which is complaining with a load noise. Worth fixing if you do it your self. Magnatrons cast about $40 wholesale. There are just a few varieties of them that fit almos all brands. Try www.partstap.com

Dec 07, 2007 | Kenmore 62622 Microwave Oven

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Microwave shuts off after 3 seconds


Although your model number doesn't seem to show up, the NNS950-series units are powered by an high-voltage inverter. And yours has failed. While an inverter (switched-mode power supply) is more efficient from a power consumption standpoint, it is more complex, thus more statistically prone to fail. These should only be examined and worked on by someone who has the necessary technical qualifications. Seriously. Often the machine-soldered connections in a microwave inverter are too weak, so they eventually fail, especially if heat is high in the area. They sometimes fail catastrophically. When not catastrophically damaged, you may hear clicking or squealing and may smell an electrical odor, which is sometimes obscured by the cooling fan. Sometimes a whole new inverter is cheaper than the time and labor required to fix the old one. If a technician is willing and able to troubleshoot and repair the inverter to component level, it will may be expensive, but may be worth it, especially if he or she will resolder and reinforce connections as needed as part of a thorough repair. That could easily make your inverter beter than a new one! You might be able to get some verbal estimates if you call Panasonic-authorized appliance / microwave repair shops and ask then specifically about inverter component-level repair and simple inverter replacement costs for your exact model number.

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