Internal Unit Overtemperature

What does OH4 mean?

The internal temperature of the drive unit itself has become excessively high. This is typically due to continuous operation at high loads, insufficient cooling, or a malfunctioning internal cooling fan. Sustained internal overtemperature can severely degrade electronic components, leading to reduced reliability and potential failure of the drive.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Inspect the internal cooling fan(s) of the drive for proper operation, cleanliness, and replace if faulty or damaged.