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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.

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.

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
Open Manual (Page 180)Search more codes in this manual