Display shows Hi, and the unit may beep; the interior is warm.

Immediate checks:

• Ensure door is closed: Verify the door is fully shut and the gasket is sealing all around. Correct any obstructions.
• Allow recovery time: If the door was open or the unit was recently unplugged, allow several hours for the temperature to drop. The Hi indication may clear automatically.
• Check cooling system: Listen for compressor and fan operation. If they are not running at all, check the power outlet and the unit's power switch.
• Inspect cabinet sensor: If the interior feels cool but Hi is displayed, test the cabinet temperature sensor for an open circuit and replace if necessary.
• Clean condenser and ensure ventilation: Overheating due to blocked airflow can cause high interior temperatures. Clean dust from the condenser and provide proper clearance.

Professional service: If the compressor runs but the temperature does not drop and Hi remains, the sealed system may be compromised and should be checked by a refrigeration technician.