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  1. #1
    Join Date
    Oct 2009
    Location
    aiken s.c.
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    162

    Manitowoc s machine

    Checked a Manitowoc S420 machine and it has no water flowing to the trough.There is water coming to the valve.Checked voltage at the plug going to the valve and only had 5 volts.Took a cheater cord and connected 120 to the valve and it worked o k. Right now I am thinking the board is bad.Any idea's. I was kind of in a hurry and I didn't check the light on the board but the machine will start, just no water.

  2. #2
    Join Date
    Mar 2007
    Location
    wedged in freezer shelf
    Posts
    6,132
    Sounds like a Dirty water sensor.
    With everything connected turn it on and the valve gets power for five sec. After the compressor starts. Check if you see water enter then turn off. Then you can disconnect the water sensor wire from the board and see if it fills.
    I haven't seen any boards fail that way. It's always been a dirty sensor.

  3. #3
    Join Date
    Mar 2007
    Location
    wedged in freezer shelf
    Posts
    6,132
    Sorry if that was vague
    You disconnect the sensor after the compressor starts up. Be careful in the control box

  4. #4
    Join Date
    Oct 2009
    Location
    aiken s.c.
    Posts
    162
    Whats the best way to clean the probe?The service manual mentions ohming the probe.Is this just to be sure there is continuity?

  5. #5
    Join Date
    Oct 2009
    Location
    aiken s.c.
    Posts
    162
    I meant low ohms ,I said continuity,sorry

  6. #6
    Join Date
    Mar 2007
    Location
    wedged in freezer shelf
    Posts
    6,132
    You would want to check continuity if your fill valve never turns off. You must have read that under another symptom (water not turning off).

    With a machine that will not fill you would most likely find some high resistance to ground if you wanted to test with a meter but the best way to test is by removing the wire after you are in the freeze cycle. The scale or slime build up on the dirty sensor will provide the path especially when wet. The best way to clean the sensor is to take it completely out and scrub cleaner inside and out with a small enough brush. Its a good time to clean the flat area around the sensor mounting which will be dirty.......... even if it doesn't look dirty it is
    “If You Can Dodge A Wrench You Can Dodge A Ball”

  7. #7
    Join Date
    Mar 2007
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    wedged in freezer shelf
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    .
    Last edited by itsiceman; 05-01-2013 at 07:54 AM. Reason: double post
    “If You Can Dodge A Wrench You Can Dodge A Ball”

  8. #8
    Join Date
    Jul 2000
    Location
    Guayaquil EC
    Posts
    10,078
    The ice thickness probe continuity check only tests for a broken wire or something similar. You can't measure the effect of mineral scale buildup with a multimeter.

    I'm not sure of the proper electronics terminology for it, but I think it's in an RC circuit and the probe works rather like an antenna, sensing changes in capacitance.

  9. #9
    Join Date
    Mar 2007
    Location
    wedged in freezer shelf
    Posts
    6,132
    Happy birthday ice
    I would agree its not a conclusive test but I wouldn't say can't
    I'll get back some day with some test results.

  10. #10
    Join Date
    Mar 2007
    Location
    wedged in freezer shelf
    Posts
    6,132
    This was a dirty water sensor on a S
    It was fairly slimed up and giving them a fit working then not working.


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