Heat Sink Overtemperature

What does OH mean?

The temperature of the drive's heat sink has exceeded its maximum permissible limit. This is often caused by high ambient temperatures within the control cabinet, insufficient ventilation, a dirty heat sink impeding heat dissipation, or incorrect mounting position restricting airflow. Overtemperature significantly shortens the lifespan of electronic components and can lead to drive failure.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Verify the drive's mounting position allows for proper natural or forced convection cooling, correcting if it's restrictive.