OH
Drive Overtemperature
Schindler · Altivar 212 Variable Frequency Drive
What does OH mean?
This fault indicates that the Altivar 212 drive is overheating due to issues with its cooling system, ambient conditions, or internal sensor malfunction, leading to a trip.
Common Causes
- The drive cooling fan is not working.
- Ambient temperature is too high.
- An enclosure air vent is blocked.
- A heat source is too close to the drive.
- The drive heatsink temperature sensor is malfunctioning.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Restart operation by resetting the drive detected fault after allowing the drive to cool off.
- 2
Decrease the ambient temperature or ensure proper airflow around the drive by clearing blocked vents.
- 3
Remove any heat-generating sources from the proximity of the drive.
- 4
Check the operation of the drive's cooling fan.
Verified technical data. Last updated: March 2026
Related Faults
Source: Schindler Altivar 212 Variable Frequency Drive