Freezer displays E20, which may indicate a defrost overheat or safety trip.

Safety first: Unplug the freezer immediately if you suspect overheating. There is a risk of fire if the unit is left energized.

• Inspect the evaporator area: After cooling, remove the rear interior panel and check for signs of melting or scorching near the heater.
• Test the defrost thermostat: At room temperature, most defrost thermostats should be open. If it shows continuity when warm, replace it.
• Check the heater control: With the unit unplugged, verify that the heater is not directly shorted to the line through damaged wiring. Repair any shorts.
• Inspect the control board relay: Inspect the defrost relay on the main board. If it is welded closed or burnt, replace the control board.
• Verify operation: After repairs, monitor a full defrost cycle to ensure the heater turns off properly.