E-21

CPU Error 2 Fault

Schindler · Altivar 212 Variable Frequency Drive

What does E-21 mean?

This fault indicates an inoperable condition of the control board CPU, suggesting a critical internal hardware failure within the Altivar 212 drive.

Common Causes

  • The control board CPU is inoperable.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Contact Schneider Electric to repair the drive.

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Verified technical data. Last updated: March 2026

Related Faults

EPH0Output Phase Loss FaultE-19CPU Communications ErrorErr7Current Sensor Fault
Source: Schindler Altivar 212 Variable Frequency Drive
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