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Thread: FIXED: ZISS420DRJSS GE Monogram side by side built-in doesn't hold temperature

  1. #41
    Join Date
    Dec 2018
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    Orange County, CA
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    13

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    I just checked the defrost thermistor reading 9 kohm. Still hasn't reached the room temperature yet, but the resistance is decreasing. I'll check it again tomorrow morning when reached room temperature, then I plan to turn on the refrigerator to reach 0F freezer temperature which should read 42 kohm according the chart provided at post #26. This will sure check the thermistor operation.

    What bothers me is the ice layer buildup on the drain pan. Even after few days of operation, I see some frost buildup in the coil area (which I think this is normal), but ice layer already has been formed on the drain pan. This led me to believe the drain pan heater problem, but the resistance reading checks ok. Drain hose was cleaned out before turning the refrigerator back on. Do defrost heater and drain pan heater turn on together during defrost cycle, or controlled separately by motherboard? If thermistor checks out ok, the only thing left is the motherboard, which I already replaced, but it's possible I could have bought a defective unit.

    Rick, I need your expertise to provide me some suggestions. Please shed me some light!

  2. #42
    Join Date
    Jul 2006
    Location
    Murray, Utah 84107, United States
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    OK, don't make this more difficult than it needs to be. You're going way over the top with this thermistor. Pull the thermistor out of the clip, cut the two thermistor wires about 6" below the thermistor, strip the wire ends (4), put it in a shot glass full of ice and water, measure the resistance, reinstall it and you're done. It takes twenty, thirty minutes tops. The evaporator thermistor lives in a constant below 0 environment. Checking it at room temperature is not necessary. You only need to make one resistance measurement and GE says that measurement should be taken at 32F.

    After a defrost cycle is the dwell period. The compressor and fans remain off. The pan heater only turns on when the defrost heater turns on and remains on after the defrost heater turns off during the entire 20 minute dwell period. The evaporator thermistor is used to terminate the defrost cycle.
    OWNER RICK'S APPLIANCE REPAIR
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  3. #43
    Join Date
    Dec 2018
    Location
    Orange County, CA
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    Rick,

    Since I already checked out 16 kohm at 32F, I wanted check the resistance at a different temperature. I let the freezer reach 0F, and I'm measuring 51.5 kohm. Since the evaporator area should be colder than 0F, 51.5 kohm (-6F?) tells me the thermistor is good. This concludes that every single component related to defrost cycle checks out good except for the motherboard, which I replaced about two months ago.

    One more thing I noticed was that after I put the top panel back on today morning to turn on the refrigerator, the evaporator fan motor has been making louder noise. I used to hear this noise right before everything shuts down due to the heavy frost build up. Is it possible that the bad evaporator fan motor could cause frost build up?

    I'm willing to try out another motherboard, but do these units have high defects rates?
    Any suggestions are greatly appreciated. Thank you.

    P.S. I don't think I ever described my GE monogram refrigerator trouble symptom in details. Let me try to be brief:
    Evaporator fan motor is making louder noise than usual, then start noticing small ice drip buildup in the freezer section which came from evaporator drain pan overflow. Within couple of days, both freezer and refrigerator temperature starts rising. Once this happens, compressor fan is always on and evaporator fan is completely off. Heavy ice buildup in the evaporator drain pan. Disconnect power and let the ice melts a day or two. Put the power back on, the refrigerator works good for a month or longer until the same symptom shows up again.
    Last edited by sungpark; January 14th, 2019 at 03:25 AM.

  4. #44
    Join Date
    Jul 2006
    Location
    Murray, Utah 84107, United States
    Posts
    31,825

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    A bad evap fan could cause some frost build up. Where did you get the board ? Any warranty left on the board. RC and APP have a 1 year warranty.
    OWNER RICK'S APPLIANCE REPAIR
    APPLIANCE TECHNICIAN FOR 31 YEARS
    REFRIGERATION SPECIALIST
    ONLINE SERV TECH: ApplianceBlog.com
    CERTIFIED TYPE 1; TYPE 2.....REFRIGERATION SERVICE E.S.

  5. #45
    Join Date
    Dec 2018
    Location
    Orange County, CA
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    13

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    I bought the main board from amazon. This time, I'm definitely getting it from the store with 1 year warranty. Evap fan seems working fine, just making louder noise than usual. Should I get a new unit as well?

  6. #46
    Join Date
    Aug 2004
    Location
    McMullen Valley, Arizona
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    96,002

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    Rick is right on the money!

    Your overthinking this, its very simple, we use process of elimination, if the evap. thermistor and defrost heater ohm test good, all it can be is a bad motherboard. Now that you told us where you got the motherboard from its likely bad from amazon.

    That's why we tell folks NOT to get parts from amazon.

    Send it back and order it here:
    WR55X10560 Board Asm Main Contro


    Jake
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