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Thread: SubZero 501F Freezer Ice Maker - Need Help

  1. #1
    Join Date
    Oct 2018
    Location
    Montgomery, AL
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    3

    Default SubZero 501F Freezer Ice Maker - Need Help

    Model Number: 501F
    Brand: -major brand-
    Age: Less than 1 year

    History:
    ...Ice maker stopped working. Fill tube frozen. Heated with hair dryer and working again
    ...But much ice build-up inside freezer. Cleaned drain tube and in process removed ice maker
    ...Replaced ice maker. Shut-off bar all the way down. After 48 hrs, no ice. Temp is 3*
    ...Taped ice drawer switch on. Tried T-H short to cycle ice maker -- nothing
    ...Tested L-N -- no voltage, but disconnected harness and have 120V
    ...Used 1" probes into test holes until they bottomed out so clearly making contact
    ...Harness is properly seated in ice maker but it's as if not connected during cycle/voltage tests

    Does the door fan and/or light switch have to be depressed as if door closed for ice maker to work? There is current at harness with door open.

    what an I missing???

    Thanks in advance for any help!

  2. #2
    Join Date
    Aug 2006
    Location
    NY
    Posts
    804

    Default

    If you have 120Vac at the harness going to the ice maker but not at points L and N on the ice maker module the likely culprit is that the thermal fuse that clips to the bottom of the ice maker is open. Remove the ice maker from the freezer. Remove the harness from the ice maker. Check resistance across the ends of the wire containing the thermal fuse. Should be less than 1 ohm. If circuit is open (infinite resistance) then you should replace the ice maker since that would mean the ice maker had an internal failure that caused it to overheat and trip the thermal fuse.
    Having trouble finding the right ice maker right now. Will research it more if we determine the ice maker is the actual problem

  3. #3
    Join Date
    Oct 2018
    Location
    Montgomery, AL
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    Quote Originally Posted by jackofalltrades View Post
    Check resistance across the ends of the wire containing the thermal fuse. Should be less than 1 ohm. If circuit is open (infinite resistance) then you should replace the ice maker since that would mean the ice maker had an internal failure that caused it to overheat and trip the thermal fuse.
    Having trouble finding the right ice maker right now. Will research it more if we determine the ice maker is the actual problem
    Sorry, but not sure how to do this. Do I take the module off the ice maker and test inside? A pic would be helpful if available. Tks

  4. #4
    Join Date
    Jul 2006
    Location
    Murray, Utah 84107, United States
    Posts
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    Quote Originally Posted by toliphint View Post
    Fill tube frozen. ...After 48 hrs, no ice.
    You'll need to replace the water valve or water is going to keep on freezing inside the fill tube. When it blocks the water from entering the ice maker the heating element can heat the mold up enough to open the thermal fuse in the wire harness. On the back of the ice maker push on the connector and the connector will come out of the power module. The thermal fuse is inline on one of the wires and clipped to the ice maker mold. Almost all the parts for the 501F are no longer available but you can still match most of them up with Whirlpool parts. Here's a diagram:
    Click image for larger version. 

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  5. #5
    Join Date
    Oct 2018
    Location
    Montgomery, AL
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    Default

    Well --- problem solved. Discovered on my model that the orange 120v wire to the ice maker with the thermal fuse is a larger wire than the other 3 wires going into the harness connector. But the plastic connector that receives the wires has the same size holes, so it's difficult for the larger wire to be pushed into the connector all the way. Because of this, the metal connector was not pushed far enough into the connector and was not making contact with the icemaker module. Thus no L-N voltage or T-H cycling.

    Skinned about 1/8 inch insulation off of wire and wire-end connector now locks into the connector and all is well!

    Thanks for the help.

  6. #6
    Join Date
    Jul 2006
    Location
    Murray, Utah 84107, United States
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    Default

    Cool! good job
    OWNER RICK'S APPLIANCE REPAIR
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    REFRIGERATION SPECIALIST
    ONLINE SERV TECH: ApplianceBlog.com
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