Question about Panasonic NN-T654SF Microwave Oven

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All of a sudden, the microwave won't heat food though the microwave is running. Also, it stops intermittently after 30 seconds. Is it time to purchase a new one or is there an easy fix?

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Hi,
Here is a tip that will help you to figure out what is wrong with your Microwave Oven....

Microwave Oven Basic Troubleshooting Tips
http://www.fixya.com/support/r5508031-microwave_oven_basic_troubleshooting

heatman101

Posted on Aug 08, 2010

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My microwave stopped working one day. A few times before it completely stopped working, the magnetron would pulse and then shut off. Now the only time it does that is when nothing is in the microwave. If...


If this is an older oven, or an oven that has heated a lot of popcorn, or other low water content foods, then you might be looking at a magnetron that has become intermittent. The symptoms you describe, however, do not match the symptoms you usually see with this type of failure.

Based on your description of the problem, I'd investigate the possibility of an intermittent power relay. The contacts on these eventually burn and sometimes don't make a good connection. After the contacts first close, there're is an initial surge of current that might make the relay functional for a second or two, and then the damaged contacts no longer make contact.

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If you have this model microwave and it was working fine, then one day it stopped heating items placed inside there are a handful of different issues that could be the problem. In my case it was intermittent, over a period of a few days it would sometimes work (heat) and sometimes not. NO MATTER if this is what your's is doing or if it stopped heating all together. If you decide to let it dry out, or not use it for a while to see if it was a one time occurrence, or whatever the reason, the first time you put something in and probably for the next 10 times at least (this assumes it starts to work again), make sure you are right there with it while it is cooking. Don't assume you can put something in, go do something and come back when the timer is beeping. There is a chance (as this happened to me) that your food inside will CATCH FIRE! Normal food item placed inside, no metal, nothing different than the numerous times before when this had been cooked but when we smelled smoke we came running. Fortunately it started and finished inside the microwave but that's not a guarantee, it could spread. Play it safe. Never had a problem like this before and never heard of a microwave cooking something until it caught on fire (especially since the time entered for the cook was 30 seconds) but it did.

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I would try troubleshooting the "defrost circuit". The behavior sounds like the microwave is cooking in the defrost mode, where it actively cooks then stops allowing the food to rotate and the heat to spread then actively cooking again.

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My Frigidaire microwave model# PLMVZ169GCC does not heat food. It runs and makes a loud noise, the plate turns but does not heat up. It is only 2 yesrs old. Thank you for your help.


Intermittent load noise (usual intermittent pulse noise is exaggerated) and the food is not heating though everything else seems to opperate normally: The Triac or Diode is capute.

You need to replace this part (@$30), but first need to discharge the capacitor, which is dangerous. I am going to give it a "shot", and not a "shock", all the punn intended. I will use an long insulated screw driver to touch both of the 2/3 tines of the adjacent capacitor, which will give a load "POP!" 2-3x to insure the stored energy is diffused.
Then, hopefully, simply replace the longe wire diode.
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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.

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Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101
fkj

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Chances are you have a bad connection, maybe the cook relay or at the magnetron, but feel free to write back with details when it fails again.

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