Question about Panasonic NN-T654SF Microwave Oven

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Microwave dies after one minute

Panasonic NN-P794SFX - genius prestige worked fine for several years now suddenly after 1 minutes or so power fluctuates and shuts off before the end of set time. Warms stuff OK at times but then shuts off again (very few times error code H98. It is the power inverter. There is a brown Metallized film cap WHU 822J RATED AT 3.0kVDC outside body is cracked only but metal inside is fine. Could this be the problem.

Posted by Anonymous on


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Posted on Jan 02, 2017

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SOURCE: Microwave shuts off after 3 seconds

Although your model number doesn't seem to show up, the NNS950-series units are powered by an high-voltage inverter. And yours has failed. While an inverter (switched-mode power supply) is more efficient from a power consumption standpoint, it is more complex, thus more statistically prone to fail. These should only be examined and worked on by someone who has the necessary technical qualifications. Seriously. Often the machine-soldered connections in a microwave inverter are too weak, so they eventually fail, especially if heat is high in the area. They sometimes fail catastrophically. When not catastrophically damaged, you may hear clicking or squealing and may smell an electrical odor, which is sometimes obscured by the cooling fan. Sometimes a whole new inverter is cheaper than the time and labor required to fix the old one. If a technician is willing and able to troubleshoot and repair the inverter to component level, it will may be expensive, but may be worth it, especially if he or she will resolder and reinforce connections as needed as part of a thorough repair. That could easily make your inverter beter than a new one! You might be able to get some verbal estimates if you call Panasonic-authorized appliance / microwave repair shops and ask then specifically about inverter component-level repair and simple inverter replacement costs for your exact model number.

Posted on Dec 28, 2006


SOURCE: Panasonic Microwave about 9 years old with

In all likelihood the mangnetron is failing, or perhaps even the Power Supply is faulty. You need to have it serviced by a reputable service centre/man.
Ensure you get a firm "Quote" before proceeding, and remember these days the cost of repair can equal or exceed the price of a new one.

Posted on Jan 28, 2010

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SOURCE: error code h97, on a genius prestige microwave -

Hello :

Troubleshooting of Inverter Circuit (U) and Magnetron .

This oven is programmed with a self diagnostics failure code system which will help for troubleshooting, H97, H98 and H99 are the provided failure magnetron and inverter circuit problem areas. This section explains failure codes of H97, H98 and H99. H97, H98 and H99 appears in display window a short time after start key is pressed and there is no microwave oscillation.


The microwave is capable of giving you a serious electrical shock even when it's unplugged , so I recommend you to call a repair technician for help .

please don't forget to rate .

good luck .

Posted on Apr 13, 2010

Daniel S
  • 4323 Answers

SOURCE: H98 code appear in my


H98 error code means high voltage diode failure and to solve this issue the inverter board should be replaced. Repairing Microwave is only recommended to be done by a professional just because of the voltage present inside the unit. Hope this helps...please post back for further assistance.


Posted on Mar 10, 2011

  • 2605 Answers

SOURCE: Panasonic genius prestige microwave oven

Hello, welcome to FixYa.

I understand based on your initial post you have Panasonic NN-SD797S microwave you are receiving the H98 error, correct ?

What this indicates according to the Panasonic diagnostic charts is as follow's below...

Newer Panasonic Microwaves have a built in fault codes....

they look like H97, H98....

Troubleshooting of Inverter Circuit (U) and Magnetron

This oven is programmed with a self diagnostics failure code system which will help for troubleshooting.

H97, H98 and H99 are the codes provided indicating failure magnetron and inverter circuit problem areas. This appears in display window a short time after start key is pressed and there is no microwave oscillation.

What this means of course is the magnetron or inverter has my experience it is usually the inverter board and typically sells for around $100.00 - $125.00, I've also attached a link of your machines parts breakdown, item #32 on the second link.

I would shop around as I alluded to since it can be had for a lot less from one vendor to another.

I also decided to include a link here to a web page that has the error code meanings, flow charts to try and diagnos and other info you may find useful...**Please diagnos with caution and unplug the unit before removing any panels or attempting first**

Let me know how you make out and good luck. I'll wait for you reply and then help in any manner I can going forward if necessary.


Macmarkus :)

Posted on Sep 19, 2011

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Pushing the start button trips the breaker. All functions seems to work, fan, clock etc but it just started as soon as you push start it trips the breaker. Control panel/board seems fine no burn marks.
In all likelihood the mangnetron has failed, or perhaps even the Power Supply. or a fault that is shutting the system down for safety reasons You need to have it serviced by a reputable service centre/man. Ensure you get a firm "Quote" before proceeding, and remember these days the cost of repair can equal or exceed the price of a new one.
Service manual below, troubleshoot with that.

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