Question about Panasonic NN-P294SF Microwave Oven

1 Answer

Has Panasonic rectified its inverter design problems?

(I previously wrote a long post about this topic and it unexpectedly disappeared with one misplaced keystroke, so apologies in advance if I have repeated my posting. It?s always a good strategy to compose long (winded) postings in Word first ?) I bought my Panasonic stainless over-the range model NNP-294S in Aug 04 from a Sears clearance outlet in Canada. It wasn?t actually installed or used until about a year later pending my kitchen remodel. You are never really sure of the usage history with clearance outlet purchases, but mine looked brand new (although it had a ding on the left underside). I loved its sleek, minimalist appearance and still think this is one of the best looking units on the market. Within about 6 months (late 2005/early 2006) it started turning off after 3 seconds, although it would always eventually start working again. There were no funny smells or noises accompanying the shutdowns and when it was working, it worked very well. Since the shutdown problem was sporadic (about once a month) I tolerated it for many months. In Aug 06 I discussed the problem on the phone with a Sears technical advisor, who said it sounded like the inverter but it wasn?t available as a part. I left things alone as for various reasons I was very reluctant to go through the hassle of pulling the unit out; I also found that the shutdowns were usually quickly resolved by firmly shutting (not slamming) the door. However my gut told me it would be a good idea to keep my Sears maintenance agreement current in case of eventual catastrophe. Alas, my intuition proved accurate. Almost a week ago the unit finally bit the dust altogether ? no display, power, lights or fan. I called Sears and they confirmed that the inverter was not available as a part from Panasonic and Sears doesn?t repair them, although they would send someone to look at it. In the meantime I called Panasonic Canada, who said the inverter was not replaceable as a part (and never had been) because the inverter was repairable at the component level. They said that Sears doesn?t like to repair them because ?they?re lazy.? The Sears tech who attended found that the fuse was gone, and unfortunately the only fuse he brought with him was also defunct. However he agreed from my description (and my previous conversation with a Sears tech) that the shutdown problem was likely an inverter issue. Therefore it has now become a matter to resolve with the Customer Service department, who I expect to be hearing from within the next week. Sears currently sells a newer version, NNP-295S, which appears from the specs to be identical to mine except that there are 4 fan speeds instead of 3 and 450 cfm instead of 300. Apparently the inverter IS available as a replacement part for this model. Based on the above, these are my questions: 1. I read MicrowaveSvc?s postings about the design weaknesses of the inverter. Would Panasonic have ?discontinued? this part so soon for that reason? Is this particular model a lemon? Some postings on another website suggest that one should avoid Panasonic inverter models at all costs. 2. What is the likelihood that Panasonic has resolved the design flaws around the inverter for the current model NNP-295S? Surely they must have become aware of the problems with my model and taken steps to address them? (she said hopefully) 3. If Sears offers me some cash towards buying a replacement unit, would it be better to buy the current model or keep my current unit and get it repaired at a Panasonic service depot to ?repair the inverter to component level? as both MicrowaveSvc and Panasonic Canada have suggested? Will I get a more robust/long-lived inverter that way? Any advice is greatly appreciated!

Posted by on

  • 1 more comment 
  • Jennifer White Apr 14, 2007

    Yikes - it looks like composing in Word replaces apostrophes, quotes and dashes with questions marks? How annoying.

  • Jennifer White Apr 20, 2007

    Thanks for your helpful suggestions. There are several Panasonic authorized repair shops around here (Vancouver, BC) that could fix it. Sears refuses to repair it themselves and has offered 75% of my original purchase cost, or about $350, towards a new microwave. This means I have to cough up another $350 since they are $700 Cdn. That doesn't seem right. If I want to keep the existing micro and get it fixed, it may cost about $100 but Sears won't pay for it.

    MicrowaveSvc, could you please comment on my 3rd point in my original posting? Would I be better off -- in terms of longevity and reliability -- to buy the new model or to fix the one I have? In other words has Panasonic done anything to "improve" the inverter on the latest model?

  • Jennifer White Apr 23, 2007

    Thanks MicrowaveSvc for helping out a northern neighbour. Here's what has transpired in case you or another owner of this particular model are interested.

    I decided this weekend to order the new model because they are nominally on sale at Sears this week ($30 off) and I figured that by the time I factored in the cost of repairing my existing unit on my own, a new one would be a net extra outlay of about $200 -- and, as you note, it will be a brand new unit with new warranty. Also, Sears won't warrant my current unit anymore and are refunding my full warranty cost, so I had to decide one way or another.

    I emailed Panasonic last Friday and they responded to several questions. They said that there was no design flaw in the inverter board (oh really?) and it is the same board in all their microwaves. The inverter is available as a part IF the service centre cannot repair the board, but most times the service centre has no problem repairing the board. (I wonder why they won't supply it to Sears then??)

    Let's just hope that I don't have the same problem with the new one. Panasonic's warranty is 2 years and buying it on my Visa card extends it another year.

    I also had a conversation last Friday with the assistant to Sears Canada's president, expressing my dissatisfaction that Sears' refusal to repair my microwave, which I was quite happy to keep, was unnecessarily forcing me into spending money for a new one, and I thought they should improve their buyout offer. He was corporate arrogance personified and well rehearsed in spouting Sears policy. He said outright that Sears was not prepared to negotiate and there would be no further "escalation of the process." I could write a letter to the President if I wanted to, but he wouldn't read it. At least he was brutally honest, I suppose. I doubt if Sears operates any differently south of the border.

×

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Panasonic Master
  • 9,098 Answers

Parts for this model (including the inverter) can be had via Panasonic in the US at http://www.pasc.panasonic.com/epartr Canada's safety requirements may be different enough from those in the US that Panasonic does not make the inverters available as a spare up north. Any competent electronics technician should be able to fix the inverter, but many appliance repair shops (and appliance techs) do not do component-level repair. Everyone has his specialty. You may have to call a TV shop to get this kind of service. I would definitely suggest you get a servicer who is authorized to do warranty service on Panasonic microwaves, even though this one is not under full warranty. Follow the "servicer locator" link at the page mentioned above to find such a servicer. I would suggest that you include the last letter when you refer to your model number, such as NNP294SF or whatever the last letter is.

Posted on Apr 16, 2007

  • William Miller
    William Miller Apr 23, 2007

    If you find a shop with a good technician (maybe you can talk to him or her ahead of time?) who will take time to solder all the lightly soldered and heat-prone areas, then you should get a much more robust unit.

    On the other hand, if you get a whole new oven, you get a new warranty too, and perhaps a service contract would extend that even more.

    Here's a hybrid:

    Do you have enough time left on the warranty to have the shop fix it then keep an eye on it a few months to see if it will hold up?

    If it does, you don't need Sears. If it fails soon, call Sears back and ask for the money towards a new one.

    Hope this helps.

  • William Miller
    William Miller Apr 23, 2007

    Did I mention that I love Sears?

    No, I didn't.

    *grin*

×

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

What is H94 displayed in microwave


It is probably an error code, what is the unit doing, does it heat, time down, run but no heat??? Etc Brand???

I'm betting it is a Panasonic and it has a bad mag and or Inverter. . probably best to replace the unit if that is the case. Price wise the inverters are expensive and I have had bad NEW ones sent to me. Personally I really do not like the inverters, they are certainly not as reliable as the transformers, capacitors and rectifiers, that it replaced.

Sep 22, 2017 | In Microwave Ovens

1 Answer

Panasonic Dimension 4 Microwave- Model NN D801. Whilst microwaving for 2 mins on high - heard a zapping noise. Didnt heat food. Front operating panel works. turntable still works. Any suggestions?


A "zapping noise" usually indicates a problem in the high voltage circuit. If it's an inverter oven, it should have provided you with a fault code. If a non-inverter, the most likely causes are a shorted high voltage rectifier or bad magnetron. But there are many other possible causes.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/david_29ad5d1dd86564b0

Oct 02, 2016 | Panasonic Microwave Ovens

1 Answer

I have a panasonic microwave with convection oven, grill and steamer. When I switch on the microwave, the house fuse (16 amp) cuts out. With the other functions of the oven, it works fine. Do I need a new...


you have a short circuit.
test the a) HV rectifier b) Capacitor HV c) HV transformer d) Magnetron e) test the swich for door for short.f) circuit board main is short.
see the diagrams and proceed.

10_2_2012_12_41_44_pm.jpg10_2_2012_12_42_15_pm.gif10_2_2012_12_42_35_pm.gif10_2_2012_12_43_09_pm.jpg

Oct 01, 2012 | Panasonic NN-C994S Convection/Microwave...

1 Answer

My timer stops after 5 seconds.


Since no model number was posted, I have to give a general answer.

Since it was posted under Panasonic, I'll assume it's a Panasonic.

See if one of these describes what's happening:
  • Put in time, push start and unit runs for 2 seconds, relay clicks, unit goes off. Cook time on display goes off and clock time comes back. Bad upper interlock switch and charred connector
If so, see http://031d26d.namesecurehost.com/mwd/safety.txt
http://031d26d.namesecurehost.com/mwd/disassembly.txt
http://031d26d.namesecurehost.com/mwd/doorsw.txt


Otherwise, 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.

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

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

Due to the lethal voltages used and produced in inverters, I do not recommend that an inexperienced person work on these.

Sep 26, 2011 | Panasonic NN-T990SA Microwave Oven

1 Answer

Time set does not complete


You didn't mention your brand or model number, but I'll assume it's a Panasonic since you posted this under a Panasonic category.

See if this describes what's happening:
  • Put in time, push start and unit runs for 2 seconds, relay clicks, unit goes off. Cook time on display goes off and clock time comes back. Bad upper interlock switch and charred connector
If so, see http://207.234.249.73/mwd/safety.txt , http://207.234.249.73/mwd/disassembly.txt and http://207.234.249.73/mwd/doorsw.txt

Otherwise, 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.

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 NN-T994SF Microwave Oven

1 Answer

Power to microwave but does not cook food


You didn't mention your brand or model number, but I'll assume it's a Panasonic since you posted this under a Panasonic category.

See if this describes what's happening:
  • Put in time, push start and unit runs for 2 seconds, relay clicks, unit goes off. Cook time on display goes off and clock time comes back. Bad upper interlock switch and charred connector
If so, see http://207.234.249.73/mwd/safety.txt , http://207.234.249.73/mwd/disassembly.txt and http://207.234.249.73/mwd/doorsw.txt

Otherwise, 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.

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 NN-H264 Microwave Oven

1 Answer

How do I remove the sensor inverter on the Panasonic NN-S96OWA ?


That's a misnomer.

And oven may have an inverter and it may have a sensor (usually either a heat sensor or humidity sensor).

Please note that FixYa is not currently notifying us Experts when Clarification Requests are answered.

So 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, and your exact symptoms, so we can help you troubleshoot the problem and make recommendations.

Jan 08, 2010 | Panasonic NN-S960WA Microwave Oven

2 Answers

Panasonic Microwave Oven Problem Model # NN-H275SF


I do not have service data on this model., but an inverter model will normally have 2 high voltage capacitors located on the inverter board. One or possibly both is likely shorted.

Due to the lethal voltages used and produced, I do not recommend that an inexperienced person work on these.

If you or someone you know wants to look into this, we have *critical* safety, disassembly, and troubleshooting info at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

You can get Panasonic parts here: http://www.pasc.panasonic.com/epartr

I would recommend that you contact your nearest Panasonic-authorized servicer. You can find one here.

Apr 25, 2008 | Microwave Ovens

2 Answers

Panasonic Microwave NN-A770S getting hot on right side externally


If you described this to Panasonic very carefully, and they said it's normal, then I would say keep using it until such time that you get other symptoms. The inverter has some parts mounted on a large chunk of aluminum called a heat sink. It draws the heat out of the parts and the heat radiates and/or convects away. This keeps the circuit parts from overheating. As long as you have good air flow through the vents, it sounds okay.

Sep 13, 2007 | Microwave Ovens

1 Answer

Fan coming on unexpectedly


Frannie, this is the way the oven is designed. There is a thermostat in there that is normally open. The thermostat will close at approx. 140 degrees and start the fan. When the temps. cool to about 104 degrees the thermostat will open again and the fan will shut off. Catriver..post back.

Nov 02, 2006 | GE Advantium 120 Convection/Microwave Oven

Not finding what you are looking for?
Microwave Ovens Logo

1,005 people viewed this question

Ask a Question

Usually answered in minutes!

Top Panasonic Microwave Ovens Experts

William Miller
William Miller

Level 3 Expert

9098 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17130 Answers

Devabhakthuni...
Devabhakthuni...

Level 2 Expert

225 Answers

Are you a Panasonic Microwave Oven Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...