When your residential refrigerator fresh food compartment turns warm while the freezer section is completely choked with thick ice, the malfunction is almost always caused by a failure in the automatic defrost system. When the defrost heater, defrost timer, or defrost thermostat breaks, frost accumulates continuously on the evaporator coils hidden behind the freezer back panel until it forms a solid block of ice, choking off the airflow duct that routes chilled air into the refrigerator. You can troubleshoot frost buildup easily by removing food items and inspecting the back freezer wall. You can verify that your corrective action is successful when manually defrosting the coils or replacing faulty defrost components clears the ice blockages and restores normal, cold airflow.
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