Question about Panasonic Microwave Ovens

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So my 2 year old panasonic m/w has blown up 2 "powerboards" in 3 weeks. Turn it on and 3 seconds later there is a shorting noise and the entire thing is dead. Was told there must've been a low power

So my 2 year old panasonic m/w has blown up 2 "powerboards" in 3 weeks. Turn it on and 3 seconds later there is a shorting noise and the entire thing is dead. Was told there must've been a low power draw on the plug and that's what makes this happen. The plug has no other draws on it and is a dedicated line for the m/w only - house is only 2 years old. But why after 2 years would this all of a sudden become a regular issue??

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  • Panasonic Master
  • 3,368 Answers

Interesting problem, I would suggest the bad power board is the result of something else. Check your outlet it may be wired wrong or with the wrong voltage.

Posted on Nov 25, 2014

Testimonial: "I'm not sure how after 2 years, a house that was newly built would all of a sudden have a plug that was wired wrong but I will check the panel to ensure the wires are all tight in the breaker and neutral bar as well as test the plug under load to see if there is a draw leakage somewhere. Beyond that, not sure what else can be done other than a new microwave by a different company."

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Posted on Jan 02, 2017

MicrowaveSvc
  • 9047 Answers

SOURCE: panasonic 1100W high power

It may have a blown fuse or - assuming yours is a model NN-H965 - a defective inverter. The fuse is generally located on the bottom of the chassis of the microwave. You have to remove the outer cover on a counter top model - or the front panel assembly on an over-the-range model. There are several reasons why it may blow. If the fuse is loose in the holder, the fuse and the holder should both be replaced. If - with the microwave disconnected from the wall - you can easily turn the fuse with your fingers while it's in the holder, then it's too loose. What happens is the loose connection generates too much heat, causing it to melt internally. If so, you'll usually see a ball of solder at a point where the cap meets the body of the fuse. If the fuse blows as soon as you plug the oven in the wall, or when you open the door, the problem is likely with the door switches. You can find my files "doorsw.txt" and "safety'txt" via Google. They give you the safety warnings and cover the diagnosis and replacement of the door switches. If the fuse blows as soon as you hit START, then it's likely that you have a shorted high-voltage capacitor. If the fuse blows a few seconds after you hit START, then it's likely that you have an overheating / shorting high-voltage transformer. 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 and may smell an electrical odor, which is sometimes obscured by the cooling fan. Some manufacturers do not encourage or assist technicians to repair microwave inverters. They offer the inverter as a whole assembly. But sometimes that is actually 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 repair shops and ask then specifically about inverter repair and inverter replacement costs for your model number. Be safe!

Posted on Oct 14, 2006

MicrowaveSvc
  • 9047 Answers

SOURCE: Cannot heat

Sounds like it overheated, tripped the thermostat, then the thermostat reset. Chances are you have a bad magnetron. GE may have a campaign (not a "recall", mind you!) to offer free replacements if yours is a model that has a known history of problems with the magnetrons. I would call GE and ask them about that. *grin* GE Answer Center 1-800-626-2005 24 hours a day, 365 days a year

Posted on Dec 14, 2006

MicrowaveSvc
  • 9047 Answers

SOURCE: 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.

Posted on Dec 28, 2006

  • 51 Answers

SOURCE: 2 year old ge profile spacemaker Microwave lost all power

Inside unit is a cylinder fuse which can blow for a number of reasons. External cover needs to be removed to access. If you are confident in doing this and can find & check the fuse then it would be my first guess. If fuse is OK then you will need to have repaired. If fuse isblown & you replace then it blows again,you will need to have repaired. regards

Posted on Jul 25, 2007

MicrowaveSvc
  • 9047 Answers

SOURCE: My microwave died

A microwave can be dead for many reasons.

If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the thermostat to open. When it cools, it closes the circuit and allows power through again.

If it's random, it may be a bad connection, usually on the control board or fuse holder.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If the fuse is good, it may be an open thermostat or thermal cutout on or near the magnetron or on top of the cavity / body of the oven.

At our site, we have critical safety information, info on door switch diagnosis and replacement, and disassembly information.

See our listing here on FixYa: http://tinyurl.com/yzjozk

Posted on Oct 22, 2007

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See if this describes what's happening:
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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.

NOTE: The FixYa system is not currently notifying me when folks reply to my posts, so please contact me directly for more help.

William E. Miller
prototech@usa.net
http://www.microwavedisplay.com

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