Display shows DF and the freezer may not defrost properly, leading to frost buildup.

Safety first: Unplug the refrigerator before accessing the freezer evaporator area or handling wiring.

DF indicates a problem in the automatic defrost system.

• Check for frost buildup: Remove freezer drawers and the rear interior panel. If the evaporator coil is encased in solid frost, the defrost system is not working.
• Inspect defrost heater: The heater is mounted at the bottom or around the evaporator. Look for breaks or burn marks. Test for continuity with a multimeter; replace if open.
• Test defrost thermostat/bi-metal: Located clipped to the evaporator tubing. When cold (below freezing), it should show continuity. If it remains open when cold, replace it.
• Check evaporator thermistor: On GE Café units, a thermistor monitors coil temperature. Test resistance against GE specifications; replace if out of range.
• Manual defrost: As a temporary measure, you can defrost the coil by unplugging the unit and using towels and a fan (never use sharp tools or open flames). This will restore cooling for a short period.
• Control board: If all defrost components test good, the main control board may not be initiating defrost and should be evaluated by a technician.