If your frost-free freezer has frost buildup, particularly around the evaporator, there may be an issue with the defrost thermostat. This type of freezer has a defrost heater to melt frost from the evaporator coil to keep it from frosting over. The defrost thermostat supplies power to the heater, and signals the shut-off when the defrost cycle is complete. You can test the functionality of the defrost thermostat using a multi-meter; it should have continuity when at freezing temperatures, and should be open circuit when the temperature is above 37 degrees Fahrenheit. A lack of continuity means your thermostat will not power the heater, leading to frost in the freezer. Mostly this case demands replacing a defrost heater and bimetal thermostat. Call a maintenance worker to conduct everything fast.
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