Question about GE Spacemaker JVM1640SJ Microwave Oven

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GE spacemaker microwave still not heating

I have replaced the magetron tube (under warranty) and replace the Diode. The only other two things I can think of would be the transformer or H.V. capacitor. Anybody got any ideas

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  • rws2911 Dec 16, 2008

    Now I've got it heating water very slowly, would the thermastat thats mounted on the magnatron cause this?

  • rws2911 Dec 16, 2008

    OK checked that its getting 120Vac coming in...... going to check transformer

  • William Miller
    William Miller May 11, 2010

    The thermostat is just a switch that kills power to the oven if the magnetron gets too hot.

    (Magnetron overheating is usually due to a failing magnetron or a failed cooling fan, which is critical to protect the magnetron)

    You can test the resistance of the windings of the high voltage transformer: http://www.gallawa.com/microtech/xformer...

    Usually when a high-voltage capacitor goes bad, it will short, which will result in a blown fuse. Here's how to test it: http://www.gallawa.com/microtech/cap_tes...

    Also important for proper heating is correct line voltage (100-125VAC) and proper operation of the turntable and/or stirrer.

    Another possibility is a failing power relay on the control board.

    Let us know the outcome of your testing.

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  • GE Master
  • 43,501 Answers

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