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    drmemere's Avatar
    drmemere Posts: 1, Reputation: 1
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    #1

    May 27, 2012, 03:15 PM
    Sub zero refrigerator model 501R frost on back wall
    Frost continually forms on the back wall of our Sub Zero Refrigerator - Model 501R. How can I fix this problem?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    May 27, 2012, 04:14 PM
    Quote Originally Posted by drmemere View Post
    Frost continually forms on the back wall of our Sub Zero Refrigerator - Model 501R. How can I fix this problem?
    It seems your automatic self defrost system is not working. If you have the proper tools and a wiring diagram test the following. Defrost timer,defrost heater, and the defrost bi-metal/defrost termination thermostat. The heater and defrost bi-metal/termination stat will be located inside the refrigerators freezer compartment behind the evaporator wall cover panel inclosure. I do not know where the defrost timer is located on your model number machine but it should show on the wiring diagram.
    drtom4444's Avatar
    drtom4444 Posts: 3,282, Reputation: 145
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    #3

    May 28, 2012, 09:41 AM
    Here are the service manuals to help you fix the defrost system:
    http://dl.dropbox.com/u/8010163/Sub_...frigerator.pdf
    http://dl.dropbox.com/u/8010163/Sub-...frigerator.pdf
    http://dl.dropbox.com/u/8010163/Whir...e%20Manual.pdf
    You will need a good digital meter which you can buy at any hardware, building supply, or Radio Shack store.
    kudus's Avatar
    kudus Posts: 3, Reputation: 1
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    #4

    Oct 16, 2012, 08:42 AM
    Quote Originally Posted by drtom4444 View Post
    Here are the service manuals to help you fix the defrost system:
    http://dl.dropbox.com/u/8010163/Sub_...frigerator.pdf
    http://dl.dropbox.com/u/8010163/Sub-...frigerator.pdf
    http://dl.dropbox.com/u/8010163/Whir...e%20Manual.pdf
    You will need a good digital meter which you can buy at any hardware, building supply, or Radio Shack store.
    Hi drtom444,
    I am wondering if you can share with me the installation instruction of Subzero 561 thermostat (4201260). I removed it, it has two capillaries with one bulb. I would like to know where and how long they goes into the evaporator.
    I appreciate

    kudus
    drtom4444's Avatar
    drtom4444 Posts: 3,282, Reputation: 145
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    #5

    Oct 16, 2012, 12:10 PM
    They have to match the old t-stat. If the old t-stat had 10 inches going into evaporator then the new one has to be the same way with the excess coiled up (without any sharp bends) and placed behind new one. The new one must be in exactly the same place. I have never seen one with two capillary tubes in my 35 years in refrigeration work, but anything is possible. Make sure the electrical leads are well insulated and have no contact with capillary tube or it will ruin the t-stat at once.
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