Heatsink Overtemperature

What does OH2 mean?

An OH2 fault occurs when any of the heatsink thermistors measure a temperature exceeding the level set in L8-02. This indicates that the drive's heatsink is overheating, typically due to insufficient cooling, excessive ambient temperature, or prolonged overload on the drive. Sustained high temperatures can severely degrade the lifespan of the drive's power components and lead to premature failure.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Ensure adequate clearance around the drive for proper airflow and that cabinet ventilation is sufficient.

2. 4

   Reduce the load on the drive or consider a larger drive if frequent OH2 faults occur under normal operating conditions.

3. 5

   Verify the setting of L8-02 (Heatsink Overtemperature Detection Level) for appropriate threshold.