Fan Failure Overheat 1

What does OH1 mean?

An OH1 fault signals an overheat condition specifically caused by the failure or malfunction of the drive's internal cooling fan. When L8-32 is enabled, this fault will occur, indicating that the drive's ability to dissipate heat is compromised. Prolonged operation without adequate cooling will inevitably lead to damage of internal power components and system shutdown.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   If the fan is not operating, check its electrical connections. If necessary, replace the cooling fan unit.

2. 4

   Confirm that parameter L8-32 (OH1 Detection Selection for Fan Failure) is enabled to ensure this critical protection is active.