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ErrorLib — Industrial Fault Code Library

Disclaimer: ErrorLib is an independent technical reference tool. While we aim for accuracy, always verify with the manufacturer’s official service manuals before performing maintenance on industrial equipment. ErrorLib is not affiliated with the brands listed.

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. 1

    Restart operation by resetting the drive detected fault after allowing the drive to cool off.

  2. 2

    Decrease the ambient temperature or ensure proper airflow around the drive by clearing blocked vents.

  3. 3

    Remove any heat-generating sources from the proximity of the drive.

  4. 4

    Check the operation of the drive's cooling fan.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

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Source: Schindler Altivar 212 Variable Frequency Drive
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