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Microwave wheel has stopped turning and goes back to clock

It is a Panasonic Microwave model# NN-H965WF. A month ago the glass plate began to spin as soon as you open the door. Today it stopped spinning altogether. Once you input the time to cook, the microwave does nothing and after (1) second goes back to the clock. I am an electrician with access to appliance parts nearby if this is something electrical or motor related. I am NOT an electronics guru so replacing bad resisters or capacitors is out of the question.

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  • bremole Jan 02, 2009

    No. There is no error code on the display.

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Check the platter motor for continuity. It is pretty easy to replace.

Posted on Jan 02, 2009

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Hi Interlock switchesVarious door interlock switches prevent inadvertent generation of microwaves unless the door is closed completely. At least one of these will be directly in series with the transformer primary so that a short in the relay or triac cannot accidentally turn on the microwaves with the door open. The interlocks must be activated in the correct sequence when the door is closed or opened.Interestingly, another interlock is set up to directly short the power line if it is activated in an incorrect sequence. The interlocks are designed so that if the door is correctly aligned, they will sequence correctly. Otherwise, a short will be put across the power line causing the fuse to blow forcing the oven to be serviced. This makes it more difficult for an ignorant consumer to just bypass the door interlocks should they fail or to run the oven with an open door as a room heater - and protects the manufacturer from lawsuits. (That interlock may be known as a "dummy switch" for obvious reasons and is often not even mentioned in the schematic/parts manifest.) Of course, should that switch ever actually be used, not only will the fuse blow, but the switch contacts will likely be damaged by the high initial current! This also means it probably wouldn't be a bad idea to replace the interlock switch which might have been affected if your oven fails with a blown fuse due to a door problem.
Failed door interlocks account for the majority of microwave oven problems - perhaps as high as 75 percent. This is not surprising considering that two of the three switches carry the full oven current - any deterioration of the contacts results in increased resistance leading to their heating and further deterioration. And, opening the door to interrupt a cook cycle results in arcing at the contacts. Complete meltdowns are not unusual! If any defective door switches are found, it is probably a good idea to replace all of them as long as the oven is already apart.
The typical door switches and their function:

  • Door Sensing: Input to the microcontroller to indicate the state of the door.
  • Interlock Monitor: Shorts out the AC line (and blows the main fuse) should the Primary Interlock not open due to incorrect sequencing of the door switches or a failed switch.
  • Primary Interlock: In series with the high voltage (magnetron) power supply so cuts power when the door is open.
Note that if the Door Sensing switch should malfunction, peculiar behavior may occur (like the fan or turntable operating at the wrong time) but should never result in microwaves being generated with the door open.

Posted on Jan 02, 2009

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The motor on the bottom may have failed... or if belt driven the belt may be off or broken... if gear driven same type of problem

Posted on Jan 02, 2009

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Tell me is there any error code on display?

Posted on Jan 02, 2009

  • ronny2051 Jan 02, 2009

    k...
    there is a problem with the motor (rotating the plate).
    needs to repair by a service man.
    Thanks for your question

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Panasoni microwave NN-H965WF fan stays on when door closed


Because Panasonic use an inverter system to generate microwave energy the machine has to cool itself down at a steady rate and this is generally the reason the fan stays on when the door is closed,hope this helps

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Why does my microwave turntable turn when I open the door?


We recommend you have the microwave evaluated by an authorized service center.

Authorized service centers can be located in the below link.

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I have a panasonic microwave oven model # nn-h965wf which has a bad inverter board. how do you replace it


if your unit is attached to the kitchen your need to use the screwdrive for to loose and remove the microwave.
2)proceed and open the carcase and see the screw inside of the board
3) caution can be there to due the magnetron (valve electronic), and proceed to unscrew with screwdriver and take out the board.
4) proceed in contrary sense.
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Jul 11, 2012 | Microwave Ovens

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Hi, my panasonic nn-c784mf stop spinning, seems like the bolt at the center is stuck. Any solutions? Thanks!!!


If you are talking about the turntable with the glass plate that is not working. It is caused by a defective turntable motor, the only solution is to have it replaced, but considering prices as they are probably better to replace the microwave oven.

Apr 04, 2012 | Panasonic Microwave Ovens

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What is the dimension of the rotating plate I broke mine


Here is a link to the replacement glass cook tray for your Panasonic NN-S961 microwave:

http://microwaveglasstrays.com/shop/panasonic-microwave-glass-turntable-plate-tray-f06014m00ap-p-156.html


And here is another link to that part from Sears Parts Direct:

http://www.searspartsdirect.com/partsdirect/part-number/Panasonic-Parts/Microwave-Parts/F06014M00AP/0022/568/Model-NNS961/0789/0123245?keySuffixId=NA&pathTaken=partSearch&pathRender=modelComponent&documentCompId=50019470&diagramPageId=00001&productTypeId=x&searchModelNumber=NNS961&subCompDesc=Cabinet%20parts&brandDesc=PANASONIC&modelDesc=MICROWAVE&blt=11


Just use your mouse to click on the link, which is the underlined and highlighted text just above. This will open a new web browser page automatically for you and allow you to view the information and items at the website indicated.

As you can see from the website, the tray has the following dimensions:

Glass tray measures approximately 16 1/2 inches in overall diameter.

Outside diameter of turntable track is 10 7/8 inches.


I hope that was helpful to you, good luck and take care.

Joe.

Sep 06, 2011 | Panasonic NN-S961 Microwave Oven

1 Answer

My model nn-p295wf microwave stopped working ,all power just stopped, about a year ago. I took it to a repair shop and they replaced the DIODE and the fuse, then it worked again. Afew weeks ago it happened...


Replace the magnetron, safety fuse and diode as a set and check the door interlock switches.
That should get it working for another year or so.
Don't forget microwave mains fuses are special sand filled and semisurge type.

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Panasonic NN-P794SFR microwave unit that spins not rotating


there is a switch to turn it on or off. the turntable is replaceable

Feb 07, 2010 | Panasonic NN-P794SF Microwave Oven

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Microwave only runs for about 3 seconds.After


Chances are you have a failing magnetron.

But to allow us to help you effectively (at no charge), please post a
NEW problem to FixYa, and please include your brand name and the full model number from the tag in or on the unit, your symptoms, "Microwave only runs for about 3 seconds then stops and the timer goes back to the clock mode.After several attempts then it will work.Problem is intermitten"

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