Question about Panasonic NN-T990SA Microwave Oven

3 Answers

NN-T990SA Panasonic Microwave Stopped Heating

Well this sure stinks. For the last week the microwave has been making this high pitch squeeling noise for about ten seconds before it made its usual heating hum. The other morning it stopped making that noise and no hum anymore either. The fan runs, the turntable turns the timer times but it won't heat. Also the timer when set for one minute goes for exactly 22 seconds after starting and then the machine completely shuts down. Any thoughts would be appreciated.

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  • dstolz Nov 12, 2007

    My microwave will run 3 seconds and automatically shot off. Does anyone have a solution for fix?

  • BBarry Mar 27, 2008

    Light and timer continue to work, but the microwave no longer heats! HELP!

    For a few times, it helped if I unplugged and replugged the unit: sometimes this process resulted in correct operation, but now it doesn't help at all. I have tried all the different functions, e.g., cook, defrost, melt, etc. No heat.

  • Anonymous Mar 27, 2008

    MAG WAS BAD ALSO

  • Mike Leonard Apr 25, 2008

    Well, here's my story: my Panasonic microwave [NN-S262BF, with inverter] recently failed. It would only run for 2 seconds, making a clicking sound, then shut off. Being a do-it-yourselfer, I searched online for my symptoms and suspected the magnetron. I bought a new one for only $40 at partstore.com, and replaced it.
    After reassembly, it did indeed run for 2 minutes and boil 8 ounces of water -- success! Or so I thought... after I reinstalled it over the stove, it failed again with the same exact symptoms. Argh...
    So, back to the internet and I even called a local repair shop. They convinced me the problem was the inverter, so I bought a new one for $162 at partstore.com. I just completed that surgery this evening, and now it runs for precisely 23 seconds and shuts off -- never clicking, never heating. Now I'm cursing and losing DIY points with the wife :(
    So, my latest theory is that the bad inverter fried my magnetrons, but it'll cost me another $40 for a new one to find out. Does any one out there actually know anything about this stuff and can give me any advice? The unit is 5 year and 4 months old (just outside the 5-year magnetron warranty), and I had to replace the PC board a few years ago when it failed.
    Thanks in advance!

  • jimmy_yd Jun 26, 2008

    yes, I have the same problem with mine.

  • Anonymous Sep 14, 2008

    i have the same problem please help

  • Anonymous Mar 16, 2014

    nn ct559 our microwave lamp stopped working so I obtained a replacement and fitted it. This seemed very straightforward but now the turntable turns when the microwave is not in use, but stops working vwhen we start the microwave. I know that this sounds really odd but I'm sure I didn't touch anything else when I fitted the lamp. Any ideas anyone?

  • Anonymous Mar 30, 2014

    I have a Samsung SMH1816S that will only turn off if unplugged. It did not give me an error code, but if I shut the door it runs, and heats water, even though the light is not on and the turntable is not going. I can use the control panel to set time, and then the light will turn on and the turntable will go, but once it beeps that it is ended, the microwave goes dark but keeps running and heating. The only thing that stops it is opening the door.

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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.

Posted on Dec 23, 2006

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Nn-t990sa model microwaveoven when start the oven after 20 seconds come back to stop mode , i replace the magnetron also samea problem, what is problem...

Posted on Sep 06, 2008

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It is the magnetron. to fix mine, it cost about $55 for labor plus $5 for shipping for a total of $60. the part was still covered under the 5yr warranty.

Posted on Nov 16, 2007

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Posted on Jan 02, 2017

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SOURCE: Panasonic Model No. NN-S933BF Microwave Oven

could it be that i didn't follow the manuel because i got it second hand or is it because something is wrong with it,and i have to get it fixed.

Posted on Oct 21, 2008

  • 4 Answers

SOURCE: my microwave says "child" and won't play anymore

Not sure of the TT series models but for the NN series models the procedure is as follows:-

If "Child" is displayed in the display window, then the child safety lock is on.

To remove the child safey lock, press the "Stop/Reset" button 3 times in fairly short succession (less than 3 seconds). The time of day or just the Colon sign (:) is then displayed

If you later want to apply the Child safety lock, then, when the time of day (or colon sign) is displayed, press "Start" 3 times (again in short succession).

Hope this helps

Doug

Posted on Nov 08, 2008

  • 1 Answer

SOURCE: Panasonic NN-T994SF Microwave Oven quits after 15 seconds

my microwave shuts off after a few seconds. is there a fuse that needs replacing?

Posted on Nov 24, 2010

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There are a number of possible causes.

The following link will take you to a page with the diagnostic flow chart that you can use to troubleshoot this issue:
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Jun 17, 2014 | Panasonic NN-T990SA Microwave Oven

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Take long time to Mack hot food


your magnetron is the heating element. it sends out microwaves that jiggle the water molecules inside the food causing them to heat. this is whats malfunctioning causing your problem. youll have to have a technician replace it

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call or email the manufacturer they would have a solution , microwaves seem to be made to be disposable now (or should I say recycleable).The consumer loses bad on this racket. I think half of them are rigged to not last too long.

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Panasonic NN-T990SA mfg 2002 Door opens, tray continues to spin-light on-fan on--not cooking.


call the toll free number for the product, service centre might assist, I would not use until fixed

Sep 03, 2009 | Panasonic NN-T990SA Microwave Oven

1 Answer

We had a bad power surge during a storm last week which fried my Panasonic NN-T990saf. My question is it worth trying to get it repaired or should I just buy a new micro wave?


Although lightning damage is normally fatal to anything with electronics inside, you might remove the back panel and look for fuse holders. If you find one (minimum) or two (likely), replace them (if you have a cheap multimeter you can check for continuity) and see  if it will turn on. You may have to do a little telephone work to locate the high current fuse which is probably 30 amps.  
If you live in an area of frequent lightning strikes, investing in a 'whole house' surge arrester makes sense. These are installed in the main breaker box and any brand I've seen comes with a $10-25,000 insurance policy to replace any dead appliances that fail despite the surge protector. They cost $150-250 US plus installation which you can save if you are afraid to DIY.     

Feb 23, 2009 | Panasonic NN-T990SA Microwave Oven

2 Answers

My microwave says "child" and won't play anymore


Not sure of the TT series models but for the NN series models the procedure is as follows:-

If "Child" is displayed in the display window, then the child safety lock is on.

To remove the child safey lock, press the "Stop/Reset" button 3 times in fairly short succession (less than 3 seconds). The time of day or just the Colon sign (:) is then displayed

If you later want to apply the Child safety lock, then, when the time of day (or colon sign) is displayed, press "Start" 3 times (again in short succession).

Hope this helps

Doug

Nov 08, 2008 | Panasonic NN-T990SA Microwave Oven

1 Answer

Microwave


well you should problee buy a new one i hope you arent to old

Aug 11, 2008 | Panasonic NN-T990SA Microwave Oven

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