Freezer not freezing properly but fresh food section seems okay.

Safety first: Unplug the refrigerator before removing panels. Do not attempt sealed system repairs yourself.

• Check temperature: Use a thermometer to confirm freezer is above 10°F. It should be around 0°F for proper freezing.
• Inspect frost pattern: Remove the freezer rear panel. A uniform light frost is normal. A solid ice block indicates defrost failure; a small frost patch suggests sealed system issues.
• Manual defrost if iced: Unplug and defrost fully for 24 hours. Then test defrost heater, thermostat, and thermistor and replace faulty parts.
• Thermistor test: Check the freezer thermistor resistance and replace if out of spec.
• Sealed system diagnosis: If frost pattern is poor and compressor runs constantly, a technician must check refrigerant charge and compressor performance.