Freezer displays E20; may indicate defrost overheat or safety trip

Safety first: Unplug the freezer immediately if you suspect overheating. Risk of fire if left energized.

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