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Okay there are a few problems that can cause this. Most likely the issue is either:
If anything I have listed needs to be in more/better detail please let me know. If you have checked any of the following also let me know!
If the defrost system is faulty, it could be the defrost timer, which is normally located near the thermostat. You should be able to manually put the system into defrost. It should be easy to find. It's usually the biggest hole you see in the panel and if you look inside of the hole, you should see a round "knob" with tangs on it. With the screwdriver, turn it slowly until you hear it click. It should now be in defrost mode. If this fixes the problem it is most definitely the defrost timer.
If you don't notice that it is defrosting, you will have to pull the cover located at the back wall of the freezer section off and check the defrost thermostat or the defrost heater. The back cover usually has about 4 screws you'll have to remove first.
Once you get the back freezer wall off, you are looking at the evaporator coil. Look for a little round device that is clipped to the evaporator coil, it's usually on the right side. That's the defrost thermostat. The defrost thermostat is hooked up in series with the defrost heater.
To check the defrost thermostat, You'll need to bypass it. To do this, first disconnect the power to the refrigerator and then disconnect the wires from the defrost thermostat and connect them up directly to the defrost heater. It's pretty self explanatory once you actually see how the wires are connected.
Now reconnect power to the refrigerator and after doing these steps the defrost heater comes on, then the defrost thermostat is defective.