Move the fz temperature control one number toward the coldest setting. Wait 24 hours before measuring the temperatures.

Gene.

I do not think there is something wrong with the refrigerator. You just have to set both temperature controls properly.

Let me explain how it works. The evaporator (cooling) coils are located in the freezer. The refrigerator cools down with the cold air coming from the freezer. There is only one thermostat which senses temperature in the refrigerator which operates by the ff temperature control knob. When you move it to the coldest setting you make the temperature in the refrigerator colder.

When you move the fz temperature control knob, you operate with the air gate between the freezer and refrigerator. When you move it to the coldest setting you closing the air gate and shutting down the air flow from the freezer into the refrigerator.

The normal temperatures are: about 0°F in the freezer and 36°F-39°F in the refrigerator. You have to find proper position for both knobs to maintain such temperatures. Keep in mind that you have to move them in small increments and wait about 24 hours after any adjustments.

There is a small chance for the thermostat to be inaccurate but if you would like to save some money, you have to try to adjust the temperature controls first.

Gene.

I still believe there is nothing wrong with the defrost system but the information you provided about the refrigerator temperature control points to a bad thermostat. I would recommend to order it from APP and give it a try. Why from APP? Just because you can return the part if it would not fix the problem.

- The thermostat Part number: 2198202

You are welcome. Keep us posted.

Gene.