Question about Panasonic NN-SD797S Microwave Oven

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Panasonic Genius Prestige trips breaker

Our Panasonic Genius Prestige microwave (about 4 months of use) will trip the breaker whenever the start button is pressed.

It does not trip the breaker when sitting idle, opening/closing the door, or entering on the keypad. It only does it when the start button is pressed.

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  • lakelandjim Jul 18, 2009

    Entered wrong model number. It is SN977S

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

Illeagle
  • 525 Answers

SOURCE: Microwave causes GFCI on another circuit to trip

You may have a shorted High voltage component. Possibly a recttifier,aka, diode. This should only be replaced by an experienced repairman as an extremely high voltage shock potential exists.

Posted on May 27, 2008

MicrowaveSvc
  • 9047 Answers

SOURCE: Microwave Panasonic Genius Prestige Model

A microwave can be dead for many reasons.

It may be the fuse, which is usually located behind the grille or on the floor of the oven behind the control panel or between the door switches.

If the fuse is good, it may be an open thermostat or thermal cutout (TCO) / thermal fuse on or near the magnetron or on top of the cavity / body of the oven.

If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open.

Then when it cools, it closes the circuit and allows power through again.

When checking TCOs or thermostats, if it has a hood fan thermostat, that should read open, as opposed to the others, which should read closed.

The TCOs you need to be concerned usually with have all black or white wires only. Please reply with photos of your interior if you have questions.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If it goes dead or blows the breaker (or GFI) when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.

If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.

You should do a continuity test on the fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and put it back in, then test it again.

If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.

If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa.

You can order Panasonic parts here.

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.

Posted on Sep 28, 2008

MicrowaveSvc
  • 9047 Answers

SOURCE: error code H-98

H95, H97, H98 or H99 mean that there's a problem with your inverter, magnetron, or digital programming circuit.

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.

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Posted on Dec 02, 2008

  • 140 Answers

SOURCE: I cannot open the door of my Panasonic NN-T543W microwave

Well do not pry the door open since there is an easier remedy which will lead you in the direction that you need to fix your problem. Take the cover off after you disconnect the power to it. Once you have taken the cover off (only a few screws) you will be able to see the two latches that hold the door closed and the link that opens both of them. You can just lift both latches at the same time and it will open. After you have done that take a good look and press in on the open door button and you will see where you have the problem of the door hanging. That button should push a linkage that pushes up on both latches at once to open the door. It is spring loaded so that it comes back down so that when you close the door it will hold the door closed. Anyway that is where your problem is. Let me know if you need more hlep.

Posted on Feb 09, 2009

  • 1 Answer

SOURCE: Door Release Button not working on Panasonic Microwave NN-T664SFT

The problem I had experienced with the Door not opening easily will be resolved by removing the micowave oven top cover with a tamper proof torx head, replacing the door switch and reinstalling the top cover.

Posted on Jan 20, 2010

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Hi - my Panasonic microwave Genius Prestige shorted out. I reset the breaker on my panel and it continues to not work. I probably need a technician for repairs. Any suggestions that I can do to fix it?


Yes I've strongly adviced you to look for a qualified technician or send it to repair shop because it is quite technical to isolate the shorted parts on your unit. Remember that Microwave oven has a high wattage consumption so any careless mistake will do damaged not only to your unit itself but to you which may caused an electric shock.

Thanks for using fixya...

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