Display shows F20; refrigerator may not defrost and may show heavy frost on the evaporator.

Safety: Unplug the refrigerator before accessing the evaporator or control board. Risk of electric shock and overheating.

F20 suggests the defrost system has overheated or is operating outside safe limits.

• Inspect evaporator area: Remove the freezer rear panel and check for signs of melting plastic, scorch marks, or deformed insulation near the heater.
• Check defrost sensor: Locate the defrost sensor/thermostat on the evaporator. If it appears cracked, swollen, or burnt, replace it.
• Test heater control: With the unit unplugged, verify that the defrost heater is not receiving power continuously (this test is best done by a technician).
• Replace damaged components: Any overheated wiring, sensor, or heater must be replaced with OEM-rated parts. Secure wiring away from the heater.
• Control board replacement: If the defrost relay is welded closed or the board continues to energize the heater incorrectly, the main control board must be replaced by a professional.