Question about Panasonic Microwave Ovens

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Panasonic Inverter microwave oven Mod NNSD277 will not start in a room that is cold.......but starts ok when room warms up....is this normal...or does the oven have a problem

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  • ronels Dec 17, 2008

    I want to thank you for your attention put to oiur problem.....we have not had a visit from a tech yet but am sure this info will help. We have began to leave the night light on the microwave on at night and most mornings we are able to use the microwave so you have probably identified the source of the problem........................Thanks again...Ron Elstone

  • ronels Jan 29, 2009

    Just want to report that the suggestion of what the problem might be was mentioned to the service man///he agrred and a new board was ordered...and will be installed soon....will report results at a later time........Thank you

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  • Panasonic Master
  • 8,871 Answers

There is probably a loose connection on the control circuit board that is subject to expansion and contraction at different temperatures, or possibly a bad door switch or slightly misaligned door switch mount doing the same.

If you or someone you know decide to look into it, see these links:

http://www.microwavedisplay.com/safety.txt
http://www.microwavedisplay.com/disassembly.txt
http://www.microwavedisplay.com/doorsw.txt

If you think the problem is on the control panel, we repair these nationwide by mail for $39.95 postpaid in most cases.

Feel free to contact me directly (and please remind me of your full model number) for more information & help.

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

William E. Miller
prototech@usa.net
http://www.microwavedisplay.com

Posted on Dec 13, 2008

  • William Miller
    William Miller Jan 31, 2009

    I'm
    confident this will be a FixYa! We're happy to help you with
    free
    advice and we'd appreciate your thoughtful rating of our answer.


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1 Answer

Panasonic Inverter combination microwave/convection unit. Microwave barely working, convection ok, problem part?


your issue sounds like low output from the magnetron, if this is the case replacement of the magnetron is the only solution, Here's a link for magnetrons on Amazon to give you an idea of the expense involved:
Amazon co uk magnetron microwave
you may decide to replace the microwave instead of repairing.

Jan 17, 2016 | Panasonic Microwave Ovens

Tip

Panasonic error codes h97 h98


If it is displaying error H97, or h98, this generally means that the invertor(power supply Panasonic part number: Z606YM300BP,) is not functioning. The magnetron may also be faulty.


Here is some more information about the part. The microwave may also have a faulty magnetron. If you are unsure, then you should get someone to look at the unit for you before you go buying parts.

BEWARE... VOLTAGES INSIDE MICROWAVES CAN KILL

Panasonic part number: Z606YM300BP, supersedes all previous versions of the inverter used with the 2M261-M32J This Inverter is now available at a lower cost, it used to be £60.00 plus VAT and delivery trade price.
This inverter is fitted to many of the more recent Panasonic inverter type microwaves such as the NNC596S .Some microwaves such as Bosch and Siemens also use this inverter as they are rebranded Panasonic ovens. These ovens are upmarket models, some include advanced functions such as steaming and are normally well worth repairing.
The inverter as fitted to earlier ovens with the 2M236-M42 and 2M236-M1 is also available.

An inverter microwave oven is one without a high voltage transformer You will know you have one as it is not extremely heavy at one end. This type of microwave uses a high power DC converter, called an inverter, to produce the high voltage and filament voltage required by the magnetron.
If you purchase this item for replacement in your microwave then we recommend that you do this only if you are qualified and aware of the dangers of tampering with electrical equipment.
Failure of the magnetron is common and at times the inverter can fail as well. Sometimes the inverter fails on it's own. If your microwave blows the 10 amp mains input fuse as the cooking cycle starts then you probably need a new inverter. An instruction sheet with basic guidelines on fitting will be provided but please do not purchase this item unless you are confident about fitting it. We only accept returns if the inverter supplied is defective which is extremely unlikely.
If you have one of these ovens that is not cooking then it is worthwhile looking at the magnetron. It often shows signs of distress through overheating.

As well as the inverter failing it is also possible you could also have a defective magnetron,


Good luck and thanks for using FixYa


A FixYa rating would be spot on for this information to you.



ask
robotek

on May 07, 2008 | Panasonic NN-SN657S Microwave Oven

1 Answer

It is actually NN-T695SF, it will not warm food. It powers up then goes dim, then powers up then goes dim, it keeps doing that. Food comes out cold.


Hi, if it is an inverter microwave and the problem is cycling every 2-3 seconds, my experience is the magnetron has most likely gone short circuit and the inverter board is shutting down to protect itself and then restarting, hence your symptom.
DO NOT try to test this unless you are experienced with extra high voltages - the voltages present/stored in a microwave even when powered off can kill you.

Aug 13, 2010 | Panasonic NN-T694SF Microwave Oven

1 Answer

Panasonic NNH965BF microwave starts but immediately shuts off


your mag has gone bad and possible that the inverter board as well, not really worth the hassel

Feb 06, 2010 | Panasonic NNH965BF Microwave Oven

2 Answers

Stopped heating, shuts off before time expires


My panasonic microwave model # NN-S540BFW stops after 4 seconds after you hit the start button and cuts off on its own. What is wrong with my microwave?

Jan 12, 2009 | Panasonic NN-S763BF Microwave Oven

1 Answer

H97


Hi there..

If it is displaying error H97, this means that the invertor(power supply Panasonic part number: Z606YM300BP,) is not functioning. The magnatron may also be faulty.

You can get a new invertor on ebay.UK from here


Here is some more information about the part. The microwave may also have a faulty magnatron. If you are unsure, then you should get someone to look at the unit for you before you go buying parts.

BEWARE... VOLTAGES INSIDE MICROWAVES CAN KILL

Panasonic part number: Z606YM300BP, supersedes all previous versions of the inverter used with the 2M261-M32J This Inverter is now available at a lower cost, it used to be £60.00 plus VAT and delivery trade price.
This inverter is fitted to many of the more recent Panasonic inverter type microwaves such as the NNC596S .Some microwaves such as Bosch and Siemens also use this inverter as they are rebranded Panasonic ovens. These ovens are upmarket models, some include advanced functions such as steaming and are normally well worth repairing.
The inverter as fitted to earlier ovens with the 2M236-M42 and 2M236-M1 is also available.

An inverter microwave oven is one without a high voltage transformer You will know you have one as it is not extremely heavy at one end. This type of microwave uses a high power DC converter, called an inverter, to produce the high voltage and filament voltage required by the magnetron.
If you purchase this item for replacement in your microwave then we recommend that you do this only if you are qualified and aware of the dangers of tampering with electrical equipment.
Failure of the magnetron is common and at times the inverter can fail as well. Sometimes the inverter fails on it's own. If your microwave blows the 10 amp mains input fuse as the cooking cycle starts then you probably need a new inverter. An instruction sheet with basic guidelines on fitting will be provided but please do not purchase this item unless you are confident about fitting it. We only accept returns if the inverter supplied is defective which is extremely unlikely.
If you have one of these ovens that is not cooking then it is worthwhile looking at the magnetron. It often shows signs of distress through overheating.

As well as the inverter failing it is also possible you could also have a defective magnetron,

Good luck and thanks for using FixYa

A FixYa rating would be spot on for this information to you.


regards
robotek

May 07, 2008 | Microwave Ovens

1 Answer

Panasonic Microwave Warm


Replace the h.v. capacitor (the silver can mounted in back under the magnatron) and the h.v. diode and it will be fine.
Hope Ya Fix It!

Jan 30, 2008 | Panasonic NN-S960WA Microwave Oven

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.

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