Question about Panasonic MCM INVERTER

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I set the timer for one miute to heat leftovers and the panasonic inverter microwave just stopped sfter 3-5 seconds of use.

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6 Suggested Answers

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: PANASONIC INVERTER MICROWAVE, 1300 WATTS

  1. Same exact problem
  2. I've noted 3 different ones with the same problem
  3. Panasonic has produced a lemon, north fixing

Posted on Apr 11, 2008

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MicrowaveSvc
  • 9047 Answers

SOURCE: Panasonic microwave, model no. NN-A554W,

This usually means that there's a problem with your inverter, magnetron, or digital programming circuit.

Due to the lethal voltages used and produced, I do not recommend that an inexperienced person work on these.

I would recommend that you contact your nearest Panasonic-authorized servicer.

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

Posted on Aug 11, 2008

cactus bob
  • 267 Answers

SOURCE: microwave cut off

the main control board is "seeingf" a high amprage draw from the inverter board . you have a problem with the inverter or the magntron . parts are more than a new unit . try to stay away from the inverter type , there just not ready for prime time . google "panasonic inverter reviews " and you will see just common your problem is good luck

Posted on Jan 17, 2009

MicrowaveSvc
  • 9047 Answers

SOURCE: The oven stops partway into the set time, and doesn't heat.

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. 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.

Posted on Jun 11, 2009

MicrowaveSvc
  • 9047 Answers

SOURCE: microwave runs for 3 seconds and stops

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 and 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.

That 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.

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

Posted on May 31, 2010

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1 Answer

Panasonic microwave convection oven model NN-CD997S works normal but stop heating


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.

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Panasonic microwave problem help needed


Dan, That unit has an inverter, that is the power source for the part that puts out the Microwave energy called the Magnetron. The inverters are expensive and I stopped doing warranty work for Panasonic beacuse of them. Some pencil pusher somewhere though it was a great idea to replace 3 common fairly inexpensive parts. with that dang inverter. Microwaves have come down a lot in cost, I would buy a new one without an inverter. Sorry, wish I had better suggestions, I DO NOT LIKE THEM. LOL Sorry! Panasonic and their distributors are always out of them and there so expensive no one wants to stock them. I have had new ones sent to me that were already bad.

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Hello Two options to try: a) Press the Clock / Timer button 3 times b) Unplug, wait a few seconds, then re-plug to power up with the factory settings. You will need to reset your clock and any favourite settings.
This should work with all Panasonic Microwave models.
Good luck

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1 Answer

Heating ceases after one second


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.

May 30, 2010 | Panasonic NN-H275 Microwave Oven

1 Answer

The oven stops partway into the set time, and doesn't heat.


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. 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.

Jun 11, 2009 | Panasonic Microwave Ovens

2 Answers

Stopped heating, shuts off before time expires


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?

Jan 12, 2009 | Panasonic NN-S763BF Microwave Oven

1 Answer

When using and setting the timer (i.e. 2:00 mins), microwave would stop after 25 seconds and no heat. Please help. Thanks!


I bet it's 22 seconds. The 22 seconds is the giveaway.

In most cases, this is 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.

I would recommend that you contact your nearest Panasonic-authorized servicer.

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

Jul 14, 2008 | Panasonic Microwave Ovens

1 Answer

Help, my Panasonic NNA724M Combination Oven will no longer microwave. I can set the microwave going but after 20ish seconds the microwave stops and timer is replaced by the clock, without any audible...


This is an inverter model, and when they stop after 20 seconds, it usually means a problem in the high voltage section, either the inverter or the magnetron.

If you don't have experience troubleshooting high voltage inverters, I recommend calling a pro.

We're happy to help and we appreciate your thoughtful rating of our answer.

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This model uses an inverter to produce high voltage instead of a convential transformer system. 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. Some manufacturers do not encourage or assist technicians to repair microwave inverters. Most 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.

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