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here are lots of things that can cause cooling problems. One of the most common causes of poor cooling in a frost free refrigerator is a defrost system failure. In such a case one or the other compartment may appear to be keeping proper temperature but that too may change in a short period of time. The fridge compartment's temperature rise is usually (but not always) the first to be noticed. Frost" and "Ice"
There is a difference between "frost" (a white, snow-like substance) and "ice" (usually clear and solid). When referring to what is seen during an inspection, please keep this distinction in mind as the possible causes for each are often very different. The Defrost System
Inspecting the (usually rear) wall of the freezer compartment for a frost build up is necessary. (In the case of many GE top freezer models, check the freezer's bottom panel.) If there is a frost coating on it, it is often a sign of excessive frosting beneath it. Sometimes however the evaporator cover panel will actually need to be removed (see the illustration below) before an excessive frost build will visible.
The refrigeration system's evaporator (cooling) coil is usually in the freezer compartment. This evaporator will periodically frost over and have to be defrosted by means of a heating system. When the defrost heating system fails, the frost can accumulate to such a degree that airflow throughout the appliance is hampered. There may be just enough air circulation to cool the freezer section but that will eventually stop too.
usually that means your fridge thermostat is being blocked by items in your fridge, telling the cooling system to shut down. If your fridge and freezer are packed, the fridge might protect itself by shutting down the cooling system. Happened to us last Thanksgiving.
check to make sure compressor is running may be something simple like the relay on compressor... also make sure there is no frost build up on back wall of freezer as this would be a defrost issue and will frost up enough that it cannot move air across coil to cool....
repost with any questions....good luck to you...
More likely a defrost heater. Look inside the freezer at the back wall. Any frost there? If so, turn off refrig., unload freezer, take back panel off inside freezer, and use a hair dryer to melt off the frost. Replace the defrost heater located at the bottom of the frosted coils. (New heater may appear different than original, but instructions are included) If you don't have the defrost heater on hand, just manually defrosting the coils and re-starting the refrig will get is cooling again for at least a week before problem will re-occur. (this give you enough time to get the replacement part)
Check and see if there is frost on the back wall of the freezer. Also make sure the fan is running in the freezer. If the fan isn't running in the freezer replace it. If you have any frost or ice on the back wall of the freezer, remove the back wall inside the freezer. Check and see if the coils are completely frosted over. Thaw the coils out with a hair dryer, then measure the heater and make sure it measure there. (ohms)
If it's ok, then the defrost thermostat which is attached to the coils or the defrost timer is bad.
if there is frost build up on rear wall of freezer section the unit is not going through defrost cycle which builds up frost on evaporator and restricts cold air flow to the fresh food section. one of three things are bad. defrost heater, defrost thermostat or defrost timer. if no frost on rear wall you might be low of freon.