Question about Panasonic NN-T990SA Microwave Oven

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I can turn it on and after 3 seconds it shuts down

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1 Answer

Bosch hmb5050 shut down after 30 seconds


It may be turning off because it is not heating, does it have the lights inside and the turntable both working?

Dec 10, 2012 | Bosch Microwave Ovens

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Sumsung MU3250W shut down


The problem is your magnetron tube is leaking RF. The mag tube comes on 2-3 seconds after you hit start, and the RF interfears with the board and shuts it down. Drop the front of the control panel down and watch, it wont happen.. Get a new mag tube put in and you'll be good to go.

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Ge spacemaker jvm1650sh01 starts to microwave then loses power


See this FixYa solution.

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

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My NN-T994SFR Panasonic Microwave shuts off after 1 second.


My unit shuts off after about 2 seconds. It seems like it tries to go, but it sounds like it stops working and then 1 or 2 more seconds run off and it shuts down. Then you hit start again and it lights up inside and then shuts down. It's only about 2 or 3 years old.Any solutions?

Mar 05, 2010 | Panasonic Microwave Ovens

1 Answer

Microwave shuts down after 3 seconds


you need a new magnetron and inverter board, this is an expensive repair, unit can be replaced with panasonic parts or replaced with same size panasonic unit

Jul 17, 2009 | Thermador MBBS Microwave Oven

1 Answer

Panasonic microwave shuts off


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.

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.

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

Dec 25, 2008 | Microwave Ovens

1 Answer

Samsung MU3250W Shut down


It could have been steam or humidity.

If this is an over the range model, be sure you always use the hood vent exhaust fan when you're cooking on the stove top.

Whether it's a counter top or over the range top, always be aware that the cooling fan is running when it's cooking.

When in doubt feel for air flow through the vents.

Good luck.

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Micro wave operates for a few seconds then shuts down, light goes out, but fan continues to work


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.

The oven will also strop after 22 seconds if there are certain problems with the inverter or magnetron.

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 13, 2008 | Panasonic Microwave Ovens

1 Answer

On for 2-3 seconds and shuts down with slight wire burning odor.


http://froogle.google.com is showing this model selling for as little as $100. But as a technician, I have never cared for the inverter models. As complexity increases...

Mar 21, 2007 | Panasonic NN-T774SF Microwave Oven

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