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Normally the evaporator coils should be covered with a thin frost, not ice. If there is ice then there is something wrong with the sealed system.
Have you verified proper installation of the thermostat sensing tube and the damper control?
Also, make sure the temperature control knobs are set properly.
Gene.
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Originally Posted by: Gene  Hello, Your refrigerator has some differences in the controls design compare to most other refrigerators. It's explained more detailed in the attached file. When you replaced the thermostat which controls temperature in the FREEZER it is very important to place the capillary tube in it's holder on the damper control. I also attached the instructions on the damper control testing and replacement. Hopefully it will help you to fix it. Here are the breakdown diagrams and Parts for Maytag MTB2156DEW Refrigerator - AppliancePartsPros.comGene. Thanks, Gene. I looked into it further. There is a lightcovering of ice all across the evaporator coils. The hole in the back of the refrigerator is the drain. It now seems to me that the problem is that the compressor doesn't run and shut off properly as if the thermostat isn't working correctly even though I replaced it.
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Hello, Your refrigerator has some differences in the controls design compare to most other refrigerators. It's explained more detailed in the attached file. When you replaced the thermostat which controls temperature in the FREEZER it is very important to place the capillary tube in it's holder on the damper control. I also attached the instructions on the damper control testing and replacement. Hopefully it will help you to fix it. Here are the breakdown diagrams and Parts for Maytag MTB2156DEW Refrigerator - AppliancePartsPros.comGene.
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I've seen the other threads on this, but my problem is a little different. I've replaced the damper assembly and the thermostat. I don't see any ice build up on the coils or in the freezer. I can get the refrigerator plenty cold enough if I detach the control panel from the ceiling and let it hang down. This removes the damper, which seems to be working, from the airflow from the freezer. This is the only way I can get the refrigerator cool enough. If I reattach the control panel, the refrigerator warms up to about 40-45F and the freezer to about 20F. Here's the strange part. To reattach the control panel, you insert a short tube on the rear of the control panel into a hole in the back wall of the refrigerator. This acts as a support for the panel, but the tube is also hollow and appears to be an air path for air from the freezer. I don't know where the hole leads. However, when I insert the tube, the compressor will shut off. It eventually will come on again, but both compartments will begin to warm up. Thanks.
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