Cause : Overheat 1 (Heatsink Overheat) comes when the heatsink temperature exceeded the drive overheat level. Overheat level is determined by drive capacity (o2-04).

1. Check the temperature surrounding the drive.
2. Improve the air circulation within the enclosure panel.
3. Install a fan or air conditioner to cool the surrounding area.
4. Remove anything near the drive that might be producing excessive heat.