How to Fix / Troubleshooting

Safety: Unplug the unit. Do not use sharp tools to remove ice; you can puncture refrigerant lines.

Manual defrost: Open the door and allow the unit to defrost completely. Place towels to catch water.
After defrost: Restore power and monitor. If heavy frost returns within days, the automatic defrost system is likely faulty.
Access evaporator: Remove interior rear panel to inspect the evaporator, heater, and sensors.
Test heater and fuse: Use a multimeter to check continuity of the defrost heater and any thermal fuse. Replace any open components.
Check defrost sensor: Verify the evaporator NTC sensor is properly attached and not open/shorted.
Control board: If all components test good, the main control PCB may not be initiating defrost. Replace the PCB.

Excessive frost or ice buildup on the evaporator and rear interior wall; airflow reduced and cooling performance drops.

Possible Causes