Question about Maytag 21.7 Cu. Ft. Top-Mount Refrigerator - White

2 Answers

I have a Matag Refrigerator Model MTB2156DEW. The freezer is located on the top of the fresh food compartment. For approximately a week the refrigerator has been constantly running without cycling. Using a refrigeration pocket thermometer, I measured the following temperatures. The fresh food compartment is approximately 52F. The freezer section is below 0F. Two days ago I had noted a thin layer of ice across the bottom inside the Freezer section. No matter what setting I put the thermostat on the unit will not cycle; and the freezer remains below 0F. I cannot get the food compartment below 51F at any given time. Please let me know of your diagnosis. Thank you.

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  • kmn_43920 Apr 06, 2011

    This is a self defrosting unit. What would the permanent fix be?

  • kmn_43920 Apr 06, 2011

    Prior to disassembly, I verified that the quartz heater is good by enegerzinig it by rotating the small plastic shaft on the defrost timer. The heater did stay on for about 20 minutes without the refrigerator itself running. I opened the inside of the freezer and found the drain to be blocked with ice. I melted this with a hair dryer, as suggested. I reverified that the quartz heater did work and it glowed nicely. I poured vinegar down the drain and it flowed slowly to the pan at the bottom of the base of the refrigerator. I did not know any other way to check / clean the drain to the pan below. There really was not much ice at all on the coil. Some on the little clamp on 38F thermostat. I put my frozen food back in the freezer and turned the unit back on. After approximately two hours, the fresh food compartment is at 40F on the #2 temperature setting. The refrigerator runs continuous without cycling. Great cold air but will not cycle on and off. Please advise me of your suggestions.

  • kmn_43920 Apr 06, 2011

    I certainly do appreciate your assistance on this. I will purchase a new thermostat and will follow up with you on this. Thank you. Ken

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Defrost the unit. The fridge section cannot cool if the freezer is iced over since the fridge gets its cold from the freezer. If you don't have a second fridge use a hair dryer to speed the defrost.

Posted on Apr 06, 2011

  • 1 more comment 
  • kmn_43920 Apr 06, 2011

    My unit is a self defrosting one. I believe it should automatically defrost every 10 hours.

  • aviandragon Apr 06, 2011

    If your unit is iced up then obviously the self-defrost function was not able to stop it from getting that way. The issue is that your fridge is not cooling, not whether or not the unit is self-defrost. If ice is blocking the melted ice from draining out of your refrigerator, your unit will get more and more icy and continue to block air getting to your fridge. The defrost coils can only cover so much of your unit and the unit is not able to unclog a frozen or blocked drain. If you try the solution and it does not work then I will gladly give more advice, but that is the easiest and cheapest solution to try at this point.

  • aviandragon Apr 06, 2011

    Well it's good that your unit is cooling better, but if it's getting cold enough and still not cycling you probably have a bad thermostat. I had thought maybe you weren't getting quite cold enough to trip it but that's obviously not the problem.

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As recommended, I replaced the temperature controller and this problem was resolved. Thank you for your assistance and guidance. Ken

Posted on Apr 16, 2011

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1 Answer

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