Cause : Heatsink Overheat comes when the ambient temperature is high and the heatsink temperature is more than the L8-02 [Overheat Alarm Level].

1. Measure the ambient temperature. 
2. Increase the airflow around the drive.
3. Install a cooling device (cooling fan or air conditioner) to lower the ambient temperature. 
4. Remove objects near the drive that are producing too much heat.