Question about GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Blows the 20amp fuse when the heat is turned on

When you replace the fuse the unit comes on, but as soon as you try to heat something, it makes a loud humming and blows the fuse.

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  • mofie10 Jan 16, 2009

    I have exactly the same problem with my new JVM1540DNWW Model.

    Additionally, the Fan does not work if it is selected WITHOUT using the microwave whe I cook on the standalone regular oven below. Help Please

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  • 25 Answers

It has a short. Its likely the power $5 power diode.

It has to be checked first if its good then the mag tube may be bad.

Its likely the diode. You can test it by removing it and using a ohm meter to test it. Voltage should only flow 1 way if it flows both ways its shorted.

Posted on Jan 14, 2009

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Because of the loud snap you are hearing, my guess is you have something shorting out in the high voltage section of the microwave. I'm surprised it is not blowing the internal microwave fuse yet. Average repair cost depending of what part it going bad is approximately $150 to $200. Considering the age of your micro my suggestion is put the money towards a new one.

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The pop you heard and then the humming suggests the magnetron failed. You said you found a blow fuse and replaced it and still nothing, right? The magnetron is the most likely culprit...I would think it is safe to say that the magnetron shorted and drew enough current to blow the fuse.

Replace the magnetron and if that doesn't work, let me know here. Good Luck!

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if you inadvertantly replaced a higher current fuse with a 15amp fuse, it will blow every time.
the install guide http://www.whirlpool.com/assets/pdfs/product/ZINSTALL/8206589.pdf reccommends 20amp
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