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Quit working I have a Frigidaire MFC09M3FW1 freezer that quit working. There is 115vac coming into the thermostat from the plug, and about half of that going into the relay area. Without schematics... I'm lost. Any help? Thank you.

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  • scpojed May 29, 2009

    I've got the closest thing to a switch here... markings are ;


    MM3-19D R P


    Three post switch, but only two posts are used. There is no continuity between the used posts.

    Still confused, appreciate your help and patience. Thank You.

    If this is a bad switch, can I just bypass it?

  • scpojed Jun 01, 2009

    Appreciate your help. The klickson was the culprit. Will replace it. Thanks again for your help!!!


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The compressor should have a motor heat protect resetable snap switch called a "Klickson" located under a cover held on by a clip on the side of the compressor the klicks-on is wired between the motor relay and the compressor motor windings
start there check it with a meter for continuity
the cold control thermostat starts the compressor when the mercury vapor in the cold control bulb
attached to the evaporator calls for cooling so check it too and,let me know

Posted on May 28, 2009

  • Jim Goldsmith
    Jim Goldsmith May 29, 2009

    the relay is a one inch rectangular or, square box the klickson is a one inch round plastic box

    do not test the 3pin plug going into the compressor

    with power on and, the cold control calling for cold:

    close the relay manually with a nonconducting pen or, pencil or, jumper it

    test the klickson for continuity it should be normally closed; there should be a small red button to push in to reset it

    if it will not return to normally closed replace it


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