Core issue: Frost build up in freezer.
Resolution: Frost inside refrigerator or freezer can be caused from any of the following:
High humidity - Humidity refers to the amount of moisture in the air. The higher the humidity, the more moisture in the air. When humid air enters the inside, it forms condensation or frost.
Doors blocked - If the doors are blocked partially open, the humid air will move inside. Moist air always moves toward a cold area or surface.
Doors left open - The longer the doors are left open, the more moist air will enter.
Doors not sealing - If doors are not fully closed, the door gaskets may not seal completely allowing moist air to enter.
Blocked air vents - If air vents inside refrigerator are blocked by food products, the cold air becomes trapped around the vent causing frost to buildup.
Hot food being added - Hot food releases a lot of moisture in the form of steam causing condensation or frost.
To minimize frost buildup, especially during warm humid weather, keep door openings to a minimum and close doors promptly. Some frost inside the freezer is normal and cannot be avoided. The use of household air conditioning removes humidity from the air and reduces the amount of frost. You should make sure the doors are fully closed and gaskets are properly sealed and try to keep a moderate amount of food in both refrigerator and freezer sections to help maintain normal temperatures and humidity levels by reducing the amount of air exchanged each time doors are opened.