Fixing a residential refrigerator freezer that has stopped freezing items requires addressing airflow, defrost system, or compressor malfunctions. First, check and clean the exterior condenser coils to ensure proper heat rejection. Second, inspect the back interior wall of the freezer for heavy frost buildup; if iced over, test the defrost heater and defrost timer, as a failed defrost system blocks cold air circulation. Third, listen for the evaporator fan motor to ensure it is blowing air throughout the compartments. Fourth, check door gaskets for tight seals. You can troubleshoot internal temperatures using an independent thermometer. You can verify that your repair is successful when clearing ice blockages, replacing faulty defrost parts, or cleaning coils restores sub-zero freezing temperatures.
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