Question about Panasonic Pro NE1257 Microwave Oven

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Microwave panasonic in demonstrateion mode and won't heat remove from lthis mode

Won't heat is in demonstration mode

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3 Answers

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First try hitting the Clock pad three times.

Or if it has a Function pad, hit that, then follow the prompts. On some models, it's Function > 0 > 2.

If this is a model NE1257 (the model under which you posted) then it doesn't have a Function pad.

If none of this works, I'd suggest unplugging it for a few seconds or so, then trying again.

If none of this works, then please reply back with your brand and full model number.

We're happy to help and we appreciate your thoughtful rating of our answer.

Posted on May 22, 2008

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Just unplug and replug
hopr that helps

Posted on May 09, 2011

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I have no problem but can you explain micropower

Posted on May 01, 2010

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If the microwave oven is 7 years old or less, the cause is a bad magnetron, or the inverter board is malfunctioning, due to cost in parts and labour cheaper to replace.

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heatman101 ;';
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I have a Panasonci NN-SD686S and after a power cut last night, the microwave is now in demo mode. After power cuts previously this has never happened, and I can't find anything in my manual to...


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The microwave will not heat food. It will turn on the turntable will go around and the time will count down but the food is not heated when done. tried different heat setting with no results.


This seems to be a common problem, there are three parts that will cause this, the magnetron "heats food" a common failure, the high voltage diode and capacitor are the other two culprits. The cost to repair will approach the price of a new oven.

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try unplugging it for about 15 minutes. if that doesnt work, you might as well get a new one. i fix everything myself for just the cost of parts and i have found that what parts cost for a microwaves, its cheaper just to buy a new one.

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I had this same problem with my Maytag Microwave. Unplug the unit and plug it back in. It fixed my issue.

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Samsung Microwave runs won't heat


Test the high voltage capacitor,the rectifier diode.or the magnetron.

If it additionally does not spin and no light, then check also the door switch.

The diode and capacitors can br tested. The capacitor must be alloweddischarge before testing, or you risk to get electrocuted, even ifpower is off. Capacitors can get discharged by shorting their twocontacts.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.

All locations, and description of this parts can be located using the diagram here: Counter top.

Parts must be tested to find out what is wrong.

Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.

Regarding parts, contact the seller here to purchase parts. (here in UK).

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1 Answer

Microwave panasonic nn v453 swiches off after a few seconds timer works on demonstration mode.has Magnatron failed ?


In most cases, this is 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.

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

We're happy to help and we appreciate your thoughtful rating of our answer.

Jun 28, 2008 | Panasonic Microwave Ovens

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