The homeowner must first empty the freezer and remove the rear panel inside the freezer compartment. This exposes the evaporator coils and the drain trough underneath them. The drain hole is usually visible in the center or to one side of this trough.

In many models, a frozen drain leads to a thick sheet of ice forming on the floor of the freezer.

To prevent future clogs, a common modification is utilized by technicians and homeowners alike: the "drain heat trap." This involves wrapping a piece of thick copper wire around the defrost heater element and extending the other end down into the drain hole. During the defrost cycle, heat is conducted directly down the wire into the drain hole, preventing water from refreezing inside the opening.

The defrost drain is the refrigerator’s silent guardian against humidity. A clog is not a sign of a broken appliance but of routine maintenance neglected. By performing a 20-minute hot water flush twice a year, a homeowner can prevent 90% of refrigerator water leaks and extend appliance life by 3–5 years.