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While some appliance problems are relatively easy to repair, many require an appliance repair expert. Before hiring such an expert, developing a basic understanding of the problem is helpful.
Dripping/sweating around the freezer. This problem is usually caused by condensation (water) buildup around the freezer door. Many refrigerators use a small electric heater to stop the condensation from forming. However, the electric heater is often attached to a "power saver" switch, which allows the homeowner to turn it off. If the "power saver" switch is in the "on" position, the heater is "off," and condensation will form.
Leaking gasket. The gasket is the rubber strip attached to the outside edges of both doors. It provides a seal between the door and the body of the refrigerator when the door is closed. If the gasket is faulty or leaking, the cold air inside will continuously leak out, and the refrigerator will have to work extra hard to keep food cold. This is much like an open window in the middle of winter. Routinely inspect all refrigerator gaskets, especially the bottom refrigerator door gasket, to identify problems.
Dirty coils. Periodically clean the coils underneath the refrigerator. Dirty coils force the refrigerator to work much harder to maintain the same inside temperature and can greatly reduce refrigerator life. See your owners' manual for specific instructions.