Hi
Frost is a natural occurrence on the evaporator coils in the freezer compartment of your refrigerator. To prevent frost buildup, a self-defrosting refrigerator warms the coils using a defrost heater several times each day to melt away the frost. This frost melts into water and flows out of the compartment through the drain. If any part of the defrost system is not working properly, the result can be heavy frost buildup that may affect the cooling capacity of the refrigerator.
The defrost timer is a mechanism that tells the defroster how long to run to melt the frost. The limit switch measures the temperature in the freezer and helps to maintain it, while the heater is the key element that melts the frost. Any one of these components could need replacement at a given time, which will result in this over-frosting.
Also check this bellow link:-
http://www.ehow.com/how_4504020_test-refrigerator-defrost-timer.html
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