Answer Hello Walder, if you have frost/ice building up on your freezer wall you might have a defrost issue. Also if once you get rid of the frost/ice the unit works fine for a couple days, you definitely have a defrost issue. You'll want to test the defrost thermostat WP4387490 and the defrost heater WP2263749 before you replace the adaptive defrost control part number 4388931. Thanks! Read More... Answered by AppliancePartsPros.com | Sunday, November 11, 2018