Safety first: No need to unplug for basic checks, but disconnect power before removing panels.

Step-by-step:

Check door seal: Ensure the door closes fully and the gasket is clean and undamaged. Remove any items preventing closure.
Airflow: Avoid packing food tightly against the rear wall or air vents. Leave space for air circulation.
Fan operation: With the door closed for a few minutes, then opened, listen for the refrigerator fan. If silent, the fan or its control may be faulty.
Reset alarm: Press the alarm button to silence it. Monitor temperature with a thermometer over several hours.
If temperature does not recover: Further diagnosis of the fan, sensor, and sealed system is required; contact a technician.

Acoustic alarm sounds and AL01 appears; refrigerator compartment temperature is too high.

Possible Causes