Question about Panasonic NN-T990SA Microwave Oven

2 Answers

Turntable spinning when door opened/now microwave quit working altogether

I could KICK myself! In March/2007 my turntable would spin when I opened the door. I could still cook in it, so I didn't pay much mind to it, since I really DREADED having to find the time and chance to take it to an authorized dealer in my area. It worked that way for several months, eventually stopping in the middle of a cycle at times, until May/2007, when it wouldn't work at all. The turntable wouldn't even spin anymore when I opened the door. So I figured I'd better find the owner's manual and search for an authorized repair dealer in my area. Lo and behold! I found the purchase receipt from April/2003. We had purchased the 4 year carry-in warranty, which expired in April/2007--one month after the microwave quit completely! I feel like such a fool for not addressing the problem in March, when it probably would have been covered! My question is: can this be repaired at a reasonable cost, (totally at MY expense now!) or do I just need to go out and buy a new one (and keep track of the warranty this time)?

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  • Isabelle MacDonald Jul 09, 2007

    Thank you for your response. I will definitely take your advice and look for a new microwave.

  • klcc Dec 12, 2007

    I have teh same problem, I think it is the interlock switch, since I can stop the microwave by poking a chopstick at the bottom door latch opening at a 45 degree angle. The question is what is the part number and how much does it cost, thanks

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  • Panasonic Master
  • 9,098 Answers

.
This problem may have already been dealt with, but others can benefit from an accurate, thoughtful reply to this problem.

This is usually caused by either a bad door switch, a loose door switch mount, or a problem on the control panel.

Even though a door switch clicks, it may still be bad inside.

If you or a friend decide to look into it, we have critical information on safety, disassembly and door switches at our site, linked here on Fixya: http://tinyurl.com/yzjozk

I would say this one was just a bad door switch.

Posted on Nov 26, 2007

  • William Miller
    William Miller Nov 26, 2007

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

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  • Master
  • 5,911 Answers

It sounds like you may have a combination of a couple of problems. If the turntable is running with the door open, I hope the exhaust fan and magnetron weren't running as well. Microwave ovens use high voltage (around 14,000 volts) to produce high power radio frequency waves in the oven cavity to cook your food. If you're using an oven that is not safe, you could potentially cause serious injury to yourself. What may have happened is that an interlock might be defective and is remaining closed, causing the turntable to remain energized. Or, you could have a short in the wiring harness. Since the turntable does not run anymore, you probably have a turntable motor that is bad now also. I know a turntable motor alone runs around $35. I'm not sure about the interlock switch (if it is bad), since they come as an assembly on some ovens. So...the choice is yours. Spend the money for the service call to have someone troubleshoot it for you and then order parts, or try to purchase the parts to replace them yourself. In either case, it may not be worth the expense, since the cost could be close to what you paid for the oven in the first place. Since you no longer have a warranty, it might be a good idea to pass on this one and think about another one. I hope you find this advice helpful.

Posted on Jul 09, 2007

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1 Answer

Why does turntable rotate with door open?


The door switch could be stuck in the closed/on position. The electronic circuits could be malfunctioning. When the door is open, I sure hope than the microwaves cooking are not "ON". That could result in a very dangerous situation for you.

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If it is not cooking and the turntable will not turn, this sounds like the secondary interlock switch is bad. Almost always this failure is caused by opening the door when it is in a cook cycle. Pushing the stop button before you open the door will prevent this in the future..

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If it jumps or moves just a little when you open the door, that is normal. It it actually runs, then you have a problem. Quite often this is due to a bad door switch. Opening the door while cooking (without first hitting the STOP button) is the primary cause of door switch failure. You can visit my Web site at _ or e-mail at _ if you'd like more in information on diagnosing and repairing this problem.

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