Freezer is frosting up and cold air not getting to refrigerator below.

The most common cause for this condition is a problem with the defrost system. If the refrigerator freezer is cold but the refrigerator is warm, the evaporator fan motor might have failed. ... If the freezer is cold but refrigerator is warm the air damper control might be stuck closed or broken
The Evaporator Coils are Frosted Over
If the freezer is cold but the refrigerator is warm and the evaporator coils are frosted over, there may be a defrost system problem. Several times a day the defrost heater assembly turns on for a few minutes to melt away any frost or ice that may have accumulated on the evaporator coils. If the defrost heater assembly has burned out, or the defrost thermostat or defrost control have failed the frost will build up on the coils and eventually no air will be able to travel through the coils to provide cooling. The most common cause for this condition is a problem with the defrost system.
Evaporator Fan Motor
If the refrigerator freezer is cold but the refrigerator is warm, the evaporator fan motor might have failed. Every refrigerator has a set of coils called an evaporator. These are the coils that get cold. A small fan and motor is mounted near the coils. This fan and motor - called the evaporator fan and motor, draws air over the evaporator coils and circulates it throughout the freezer and refrigerator. If the fan fails, the freezer or refrigerator will get much warmer than usual.
Damper Control Assembly
If the freezer is cold but refrigerator is warm the air damper control might be stuck closed or broken. The air damper control is either an automatic or manually operated door which opens and closes to let more or less cold air into the refrigerator compartment. If it doesn't open properly it won't let enough cold air into the refrigerator. If the evaporator fan is running, the damper door is open and no air is coming out. The evaporator may be frosted up caused by a defrost problem.
Thermistor
If the freezer is cold but the refrigerator is warm the thermistor might be defective. The thermistor is a sensor which monitors the air temperature. It is connected to the control board. If the thermistor is defective the refrigerator does not cool or may cool continuously.
Temperature Control Board
If the refrigerator's freezer is cold but the refrigerator is warm the temperature control board might be defective. The temperature control board provides the voltage to the fan motors and compressor. These boards are often misdiagnosed. Check all other components to be certain this is the cause of the problem.
Defrost Thermostat
If the refrigerator freezer is cold but the refrigerator is warm, the defrost thermostat might be defective. Several times a day the defrost heater turns on for a few minutes to melt away any frost that may have accumulated on the evaporator coils. In order for this to work, the defrost thermostat has to sense that the coils are cold enough. If the coils are cold enough the defrost heater will turn on. If the thermostat is defective it may not be able to sense the temperature of the coils and then won't turn on the defrost heater. If the defrost heater doesn't turn on, the frost will build up on the coils and eventually no air will be able to travel through the coils to provide cooling to the freezer or refrigerator. The defrost thermostat can be checked for continuity. It should have continuity when it reaches the low temperature of its operating range.
Main Control Board
If the refrigerator's freezer is cold but the refrigerator is warm the main control board might be defective. This is not common. The cause of this problem is almost always in the defrost components.

Sounds like a defrost heater has gone out. If the frost is in the back of the freezer, it will get worse and worse until it stops cooling. You can either unplug the unit for 12 hours, let all the frost melt and then turn it back on. Or replace the defrost heater.

Hi,

Check the air return on the bottom left wall of the refrigerator side. Check for cold air flow at the top of the refrigerator when the compressor is running. If you feel no air flow, open the freezer door and see if you detect significantly more air flow after opening the freezer door. This could indicate a return air flow restriction and make sure that there no blocking of air vent at the top of refrigerator section that supplies the cold air from the freezer.Check the door seal gasket on the refrigerator for leaks.
If the vents and air flow paths in the refrigerator are proper, then check the back wall of the freezer for excessive frost. A defrost system problem could be preventing the refrigerator from cooling properly. If you do see excessive frost on the evaporator in the freezer, you may be able to restore proper cooling in the refrigerator by storing your food in an ice chest and then shutting off the refrigerator/freezer and letting the unit completely defrost for about 24 hours. Leave the doors open for air circulation. After the frost on the evaporator has defrosted, plug the unit back in and see if the refrigerator and freezer will cool properly.
If there is still same problem then you need to replace evaporator fan.

Hope this helps.

Shane

your damper vent door is not opening to let the freezers cold air in to the refrigerator compartment,its located between the refrige and freezer,also make sure the evaporator fans are running to move the cold air

I think I can assume the freezer isn't a "frost-free".
A short physics lesson; hot air holds more moisture than cold air; hot air will flow from a warm area to a colder area, and the colder area will cause the moisture to condensate and freeze(if colder area below freezing, as a freezer should be), causing frost build up.The more often the freezer is opened, the more frost will build up.
Now for 3 possibilities:1) If it is a self-defrosting type, check your defrost timer control...not working, or not working often enough.2) Door seals damaged and need replacement.3)Make the kids stay out of freezer.

take the back out of the freezer and look at the coil it should be completly frost on it if not it could be a sealed system prob

check to see if you have frost on the back panel of the freezer if so then defrost the unit and if your able to find the failure of the defrst heater or defrst thermostat,or the defrost thmer more than likely its the mother board since its a general electric frig but if you manually defrost until a repair tect can come then it will run normal until it frost up again but before you call the tech out make sure you have the frost on the back panel otherwise he'll make several trip trying to solve the problem with the frig unless its the defrst heater

The cold from the freezer is piped up to the refrigerator and if that tube gets clogged with frost or ice it will not be able to blow to the cold air into the refrigerator area. I took everything out, unpluged the unit for about 6 hours, till all the frost from the freezer was gone, wiped up all moisture and turn it back on. It worked!

Check for a frozen coil in the freezer. Air from the freezer supplies the cold air to the refrigerator section for cooling. If frost is on the back wall of the freezer section you have a defrost system problem.
Frost on the back wall of the freezer indicates timer or heater circuit failure.

Possible problems are a bad evaporator fan motor or a defrost problem. If the back panel in the freezer is frosted up then it is a defrost problem. If no frost listen for the fan in the freezer. If you don't hear it then it may be the problem. Not circulating the cold air.