Error 21 E - Defrost system issue, ice buildup

What does 21 E mean?

The control panel displays a flashing '21 E' error code. This is accompanied by ice buildup inside the Refrigerator (covering vents), a humming/buzzing noise, and eventually the unit stopping, the freezer defrosting, and the ice maker ceasing to function. This indicates a significant defrost system fault.

• Defective defrost heater or thermostat
• Faulty defrost sensor (thermistor)
• Control board issue affecting the defrost cycle
• Thick frost buildup stopping the evaporator fan

Click steps to track your progress.

1. 1

   Unplug the Refrigerator and manually defrost the entire unit completely for 24-48 hours with the doors open.

2. 2

   Inspect the freezer's back panel for excessive ice buildup and remove any remaining ice.

3. 3

   Ensure the evaporator fan is clear of ice and rotates freely after defrosting.

4. 4

   If the error reoccurs, a qualified technician should test the defrost heater, thermostat, and control board components.