This ice blockage can hamper the air flow from the freezer section into the refrigerator, causing warmer temperatures in that compartment. Many recent models have had design problems in this area. If your experience this, you should consider having a factory authorized technician see if any design modifications are necessary on your model to correct this occurrence. The heating side of the refrigeration system is called the condenser. This is where the heat from inside the fridge is released into the room air.
Many newer models use a condenser fan, by the compressor, to move air through the condenser.
These condensers can become plugged with dust and dirt to the point where very little or no heat transfer can take place. These should be thoroughly cleaned several times a year to avoid cooling problems and keep the appliance running as energy efficiently as possible. A special condenser brush is available for this job. The condenser fan motor and its blade can also develop problems. It should be checked to ensure it is operating and at full speed, whenever the compressor is running.