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Fridge not cooling

Fridge not cooling

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Thread: Fridge not cooling

  1. #1
    Join Date
    May 2013
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    1,481

    Default Fridge not cooling

    Model - MFF2557kES
    Serial - 10840782LC

    I let this fridge run a couple of hours or so. The compressor was running and the fan/fans were running. It never showed any signs of getting cold. Thermometers in both sections only went to like 60 degrees maybe a little higher.

    I assume the system has a leak. What do you normally do in a situation like this? It is a nice French door unit, but is there any need in trying to gas it up if the leak can't be found and fixed?

    I have not removed any panels to check the evaporator coils. I figured if they were freezing over, the box would get cooler for at least a little while. I will research this thing a little today and see if I can get a better idea of what I am dealing with as far as the board and such.

    Comments appreciated.
    Last edited by Boman; 05-09-2015 at 06:52 AM.

  2. #2
    Join Date
    Feb 2012
    Location
    Canada
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    Default

    I assume the system has a leak
    Leaker, restriction, inefficient compressor or any combination of these yes.

    What do you normally do in a situation like this?
    Inspect the refrigeration system, add an access to see what is or is not happening inside the refrigeration system. One common trouble maker is the discharge tube between the compressor and condenser...it sits in the defrost pan and can rot.

    but is there any need in trying to gas it up if the leak can't be found and fixed?
    Not allowed to add refrigerant gas to a system that may/will leak. Normally we pressure the system with nitrogen.

    jeff.
    http://www.applianceaid.com/
    Appliance Repair Aid

  3. #3
    Join Date
    May 2013
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    1,481

    Default

    Pressure the system to see if it holds pressure?
    Can the discharge tube be repaired or replaced then add gas? Guess not it needs to be cut and brazed. Guess I got one for parts and the scrap yard.
    Thanks

    Not allowed to add refrigerant gas to a system that may/will leak
    Makes perfectly good sense to me.

  4. #4
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    What does the discharge tube do? Release the compressed gas to let it expand before going back to the compressor to be compressed again?

    And what do you do in case of a restriction? How do you tell it has a restriction? Where the frost ends?
    Last edited by Boman; 05-09-2015 at 01:01 PM.

  5. #5
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    Pressure the system to see if it holds pressure?
    Yes. Normally split the system ( low side, high side, compressor ) and see what holds and what doesn't.

    Can the discharge tube be repaired or replaced then add gas?
    Often yes....because it sits in the defrost condensate pan we sometimes get moisture in the system and we replace the compressor at the same time.

    What does the discharge tube do?
    Carries the high temp high pressure gas from the compressor to the condenser coil so the gas can be cooled as it pass through the condense coil.

    nd what do you do in case of a restriction?
    Flush high and low side with dry nitrogen, weld in new drier and add refrigerant gas.

    How do you tell it has a restriction?
    System pressures ( gauges ).

    Where the frost ends?
    ??

    jeff.
    http://www.applianceaid.com/
    Appliance Repair Aid

  6. #6
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    May 2013
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    "??"

    I was thinking if the evaporator coils had a break in the frost, it might indicate a restriction. But, I guess a restriction could be anywhere in the lines.

    This is a very nice model, but I doubt I fool with it. Sure hate to scrap it.

    When you put access valves on these, aren't they subject to leak at some point?

  7. #7
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    Feb 2012
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    Canada
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    Default

    When you put access valves on these, aren't they subject to leak at some point?
    Weld on ones are ok...screw on ones will often leak.

    I was thinking if the evaporator coils had a break in the frost, it might indicate a restriction.
    Splotch of frost, 1/2 frosted 1/2 bare evaporator coils is an indication of a leaker, restriction or inefficient compressor....only adding an access and checking the pressures inside the system can help to narrow down which.

    But, I guess a restriction could be anywhere in the lines.
    Yes it could.
    Capillary tube, drier, high side are common areas.

    This is a very nice model, but I doubt I fool with it. Sure hate to scrap it.
    Do a visual check of that discharge tube between the compressor and condenser...it sits in the defrost pan and can rot.

    jeff.
    http://www.applianceaid.com/
    Appliance Repair Aid

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