Question about GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Not heating My JEM model GE Spacesaver II is not heating. I hear it turn on normal. Then, less than 5 seconds later it sounds like it is working harder. It makes more noise now than when it was working. When I unplug the magnatron, there is no noise. Diode? How do I test? Magnatron? How do I test? The fan is working. It has been above a stove so it has been working in a higher heat environment than counter top.

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • GE Master
  • 8,803 Answers
Re: Not heating

Are you saying that you're unplugging the maghnetron and then running it? If so, that's incredibly dangerous.

You're looking at 3000VDC which can kill instantly.

It may be a shorted diode. Unless you have a really good meter, you won't be able to properly bias the diode to be able to fully test it, but they usually short when they fail.

It may also be a bad magnetron. Most often when they fail and make noise, it sounds like someone gargling into an empty coffee cup. Odd, but true.

We have critical information on safety & disassembly at our site,
linked here on Fixya:

You can usually find helpful exploded view diagrams and order parts by entering your full model number here:

Posted on Nov 05, 2007

Add Your Answer

0 characters

Uploading: 0%


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


3 Points

Related Questions:

1 Answer

JEM 31 is not heating

Sounds like you have a bad transformer. Magnatron should check less than 1 ohm (with wires unplugged). Diode should check resistance one way and open the other. Must have a proper diode checker for this. Check resistance on the capacitor (make sure it is discharged first). Resistance should come up then back to open, reverse and same thing if cap. is good. Check resistance on transformer windings.

Nov 05, 2007 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

GE Spacesaver Microwave not heating, inside fan not working

I suggest you have the microwave oven replaced, the prices have dropped considerably for the last several years and you have got your money worth out of the unit.

Mar 02, 2012 | GE JVM1640 Microwave Oven

1 Answer

GE profile spacesaver 2.0-does not heat and slight smell of electric burning when it is turned on. Turntable turns, fans work keypads work- just no heating and the electric odor. Filters and inside are...

MOST LIKELY YOU HAVE WHAT IS CALLED A MAGNETRON THAT HAS FAILED... IT IS THE PART THAT DOES ALL THE HEATING ...YOU DO ALSO HAVE A HIGH VOLTAGE TRANSFORMER THAT SEND POWER TO THE MAGNETRON BUT IT SOUNDS LIKE A MAGNETRON.... to be honest with you unless you are servicer it normally cost more to repair and for a few dollars more you can purchase a new one..... good luck to you.....

Jan 03, 2011 | GE Profile Spacemaker Over-the-Range...

1 Answer

GE spacesaver II making loud noise and is not heating up food

Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips



Jun 04, 2010 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Heat doesn't come on in microwave

If you have the experience with discharging a capacitor and you have a (VOM) Volt Olm Meter. Unplug microwave, discharge capacitor, and check the resistance of the two thermal cut-off discs by removing the lead and set VOM to RX1. If you don't get a reading of zero, replace the discs. For part go to and enter your model number. If you found any of these suggestions helpful, please rate my solution. D. Lange

May 01, 2009 | Microwave Ovens

3 Answers

GE Spacesaver over the range microwave oven

GE Microwave ovens, and Microwave Ovens produced by GE but released under different brand names, have had several power problems for the past 20 years. Because it is so easy to sell parts and charge outrageous rates for repair GE never corrected the problems. They just continued it in the next model. They found that you would most likely purchase a new unit rather than paying $75. for a service charge, and $150. for labor plus parts (if out of warranty period).
Most failures were cold solder connections on the power relay board. These would come completely dis-connected after arcing and burning away the solder. Could be 1 month, could be years, but they knew it would happen. This power relay board feeds 120volts to the LV (low voltage) side of the HV (high voltage) Transformer. No High Voltage,,No cook. Everything seems to run normal, but if you listen carefully you will not hear the low tone from the HV Transformer. Over my thirty years in the business I have re-soldered rather than replace so many I couldn't count.
Next to that, a defective Magnetron.

Jan 05, 2008 | GE Spacemaker JVM1640SJ Microwave Oven

4 Answers

Spacesaver micro not heating

Your magnetron, HV diode, Capacitor, or control board maybe bad most of these components run with high voltage and difficult to test without the proper equipment

Oct 28, 2007 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

GE Spacesaver doesn't heat

if you are as lucky as i was...i have a ge spacesaver model jvm130...same problem. first unplug unit and check fuse on the "power control module". if fuse is ok...unscrew the screws holding the "power control module" in place...carefully tilt module and see if a solder joint needs to be re-soldered. my problem was the solder joint under the front plug (5 large wire plug). you may have to unplug the three connectors to the board to get access to bottom. this is the second time i had to re-solder...last one was several years ago though. best of luck tennisrme

Aug 21, 2007 | GE Spacemaker JVM1640SJ Microwave Oven

Not finding what you are looking for?
GE Spacemaker JVM1640SJ Microwave Oven Logo

103 people viewed this question

Ask a Question

Usually answered in minutes!

Top GE Microwave Ovens Experts

William Miller
William Miller

Level 3 Expert

8795 Answers


Level 2 Expert

224 Answers

D. E. Hev

Level 3 Expert

1059 Answers

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

Answer questions

Manuals & User Guides