Question about Panasonic NN-H664 Microwave Oven

1 Answer

22 second shut-off

App. how much will it cost to replace the magnetron, or whatever it takes to fix it??
Thanks.

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  • 8,820 Answers

If it stops after 22 seconds, that means the controller has detected a problem, usually 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.

You can find an authorized Panasonic servicer here.

Shops generally charge about $75 for a home visit, then about $75-90 to do the repair work.

You can price Panasonic parts at Tritronics, but if you don't find what you're looking for there, try here. Shops might mark up parts from 25-100%, depending on the cost of the part.

If nothing else, you can save about $75 by taking it to the shop yourself.

I'd say it would run about $200 or so if you take it to the shop.

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

Posted on Nov 08, 2008

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1 Answer

Panasonic NN-P794 NO HEAT this thing will run for 18 seconds only, then shuts off. Everything else works fine. Is it worth fixing?


Have you unplugged it and allowed it to reset itself? Sometimes the wire comes undone to the magnetron, that could be the answer. It is is bad (magnetron) it could be melted and dangerous to use. A bad magnetron is too expensive to repair. Also, another possiblity is the metalic shield may need fixed or replaced (about $20.00). If it's under warranty, take it back.

Jan 10, 2011 | Panasonic NN-P794SF Microwave Oven

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Runs for 22 seconds and cuts off


The Magnetron have a cut out thermostat, therefore the magnetron is over heated.
1.Check first the ventilation grill if it is clean.
2. Ventlitation fan if is working if not replace.
3. If the baove are ok then you need a new magnetron.
4. There is a very small chance that is the control board but we don't sagest to replace since the cost of new one is almost the cost of a new microwave.

Sep 30, 2010 | Neff H5470A0 900 Watts Microwave Oven

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1200 watt panasonic genius shuts down


If it stops after 7 seconds, it has a problem with the inverter.

If it stops at 16 seconds and is a sensor model, it probably has a defective humidity sensor.

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.

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

That may be a loose connection in the wiring between the inverter, magnetron, and/or control board, or maybe one of those components has failed.

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.

May 26, 2010 | Panasonic Microwave Ovens

1 Answer

Magnetron replaced. Message: "refer to ops instructions." ???


If it was done by a repair place just take it back and read the riot act to them. Thats NOT acceptable. If you did it yourself, I would guess it wasn't just the magnetron, probably high power diode and other things too.

Feb 20, 2010 | Panasonic NN-P294WF Microwave Oven

1 Answer

My microwave overheats after about a minute of use. It shuts off and takes about 5 mins to reset. Is there a simple fix for this without replacing the unit?


The most likely cause of overheating is the magnetron tube, which generates the microwaves. As it ages (or simply due to early failure) its power falls, it works harder and gets too hot, and a safety thermostat attached to it shuts the oven down. Then, as you've noticed, the oven comes back on when the thermostat resets.

It's possible the thermostat itself is bad and opening too early, but this is seldom the case. The magnetron can be replaced, but it's generally not worth the cost of repair. It's an expensive part, and with labor charges you'll spend close to what a new oven costs. (This is why I'm not in the service business any more. Can't make money fixing cheap appliances!)

If you want to keep this oven, take it to a shop for a diagnosis and estimate. Then let price be your guide. I don't recommend trying to fix this yourself. Even though it's not a difficult repair, there are lethal voltages under the cover and microwave leakage can result from improper repair. Leave the service to professionals.

Hope this helps you decide what to do. Thanks for using Fixya!

Feb 12, 2010 | Magic Chef MCD1311ST Microwave Oven

2 Answers

No heat


Sounds like the magnetron has failed. This is the component that produces the microwaves that heats the food.

The cost of the magnetron is about 95% of the cost of a microwave oven. Most people don't, for this reason, replace the magnetron, they replace the whole oven which is probably what you will end up doing.

There is a possibility that the circuit that provides power to the magnetron is faulty and you need to take it apart, find the proper electrical leads and test them with a volt meter. To do this you have to remove it from its mounting and take it apart. It is a fairly lengthy process however.


Benjamin

May 21, 2009 | LG LMV1650ST Microwave Oven

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My Panasonic Microwave Genius 1300W will not heat up the food and the rotate dish spins and the sensor reheat will not heat up the food. Nor cook Pop Corn when pressing the buttons to 2:00 cook time. I...


Sounds like the magnetron has failed. This is the component that produces the microwaves that heats the food.

The cost of the magnetron is about 95% of the cost of a microwave oven. Most people don't, for this reason, replace the magnetron, they replace the whole oven which is probably what you will end up doing.

There is a possibility that the circuit that provides power to the magnetron is faulty and you need to take it apart, find the proper electrical leads and test them with a volt meter. To do this you have to remove it from its mounting and take it apart. It is a fairly lengthy process however.


Benjamin

May 14, 2009 | Panasonic NN-S960WA Microwave Oven

1 Answer

Shuts off after 2 seconds


Sadly, we hear of this over and over.

This is due to a defective or loose magnetron causing electrical interference and disruption in the control circuit board.

If your magnetron was recently replaced, it may have loose mounting nuts or bolts or maybe the wire mesh RF gasket was not installed or got pinched.

It may also need a new high-voltage diode and stirrer, and the cavity may be affected.

Details are in their bulletin here. Even if your model is not on the list, the same problem can occur, requiring a kit.

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

There should also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting.

You can find helpful exploded view diagrams and order parts by entering your full model number here.

If it's within the magnetron portion of the warranty (usually 5-9 years) but out of the original full warranty (usually 1 year), then your manufacturer will cover the part cost, but not the cost to visit you or the labor charge to do the work.

They may send you a replacement magnetron. GE Customer Service is here.

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

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My first guess would be to checvk the venealation fan

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Microwave shuts off after a few seconds


Nov 22, 2007. I also had the 3 second shut off problem with my G/E 1650 MWO. Read all the above and tried them all. Finally I just took a 8" x 8" piece of Reynolds Wrap Aluminum foil and but it in an zip lock bag and placed it behind the control panel. It's been working for 2 weeks now. Just take out the 2 screws that hold the vent across the front right above the door. Next on the right side is one screw, take it out and then gently lift the control panel (panel with the buttons) about 1/2" and it will fold out and stay there. put the zip lock bag inside. Close it back up. I'd test it before replacing all the screws. You don't need to un-plug anything. Just don't stick your fingers on all the exposed parts...Mine works great now and didn't cost $0.10.

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