Question about GE Spacemaker JVM1640SJ Microwave Oven

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Microwave problem hi, iam using panasonic nna774.i replaced magnatron as the microwave was nt heating and shutting down in less than 30s iam facing another problem.microwave is heating but this time it shuts down exactly after a minute like a timer.even the mechanic doesnt understand the problem.he doubts a loose connection in the keypad.pls help me. thanks

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Re: microwave problem

Could be that magnetron is not receiving adequate cooling thus causing thermal protector to open. This is mounted on the magnetron.

Posted on Aug 02, 2007

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I bought my microwave last year,It had been working but suddenly will not heat, the light comes on table turns and sounds like it is on but will not heat? please help

Repolace the microwave, the heating components like the magnatron would cost almost as much as a new microwave. If money is an issue try Goodwill, they usually sell microwaves for about 5-10$ which is WAY less than cost of parts.

Sep 20, 2012 | Panasonic Microwave Ovens

1 Answer

Microwave is still running when the door is open

The cooling fans run for a time after the magnatrons have stopped, The magnatrons are the heating components so I dont think you are in any danger as the microwave doors are double locked so the magnatrons cant run once the door is open

Sep 27, 2009 | Panasonic Microwave Ovens

1 Answer

Microwave runs for about 20 seconds then shuts off.

My mother had the same problem and she was going to trash it. Me being an extreme environmentalist, dint wanna let it go to the scrapyard. Got it down to Mumbai India checked with the engineers down here and rectified it. Problem was with the Magnatron. You would need to replace it. Well this one's getting repaired and off to a institution in need like the Home for the Aged rather than some scrapyard.

Apr 18, 2009 | Panasonic NN-SN657S Microwave Oven

2 Answers


your magnatron needs replaced! (It may cost less for a new one then to fix this one!)

Dec 09, 2008 | Sharp R-930AK Convection/Microwave Oven

1 Answer

Microwave oven provides no heat

I would suspect that your (or any) microwave that is run empty and runs but does not heat probably has a failed magnetron.

With your model number (usually found on as together on the back, inside the cavity or around the door frame) we may be abel to point you to parts and repair sources.

Aug 30, 2008 | Magic Chef CMV1000B Microwave Oven

2 Answers

Magic Chef MCO153UW

You absolutely need the magnetron cooling fan to be working, or the magnetron will be destroyed!

It is part # 3511800100 and you can order it for less than $20 here.

Far less than a magnetron.

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

Aug 28, 2008 | Microwave Ovens

1 Answer

GE JVM1870 Runs, but won't heat up

use a high voltage probe to check high voltage, if present replace the magnatron if no HV replace the high voltage board this is the board that has the heavy wires to the magnatron

Feb 06, 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

1 Answer

Microwave won't heat.

Magnatron is suspect. Need to put a voltmeter and see if the input (primary) side to the high-voltage transformer (big heavy iron thing in there) is getting 120Vac. Don't touch the other (high voltage) side of this transformer. If the power is there, you are looking at replacing the magnatron. Its affordable if you do it yourself - buy the part on EBAY - lookup "universal magnatron"

Dec 30, 2007 | Maytag UMV1152BAS Microwave Oven

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Microwave is nt heating

The problem of shutting down after 29 seconds is due to a defect in either the magnetron or the inverter. It will need service, preferably by a professional due to the lethal voltages inside. You should be able to find a servicer at the Indian site:

May 03, 2007 | GE Spacemaker JVM1640SJ Microwave Oven

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