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ErrorLib — Industrial Fault Code Library

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906

DCU FAILURE FAULT

Otis · DSD 412 DC Elevator Drive

What does 906 mean?

The update mechanism for the Dual Port RAM from the Drive Control Unit (DCU) is unreliable. This condition necessitates the replacement of the Drive Control PCB (A1) and will shut down the DSD 412 drive. A power down is required.

Common Causes

  • Unreliable or intermittent updates from the Drive Control Unit (DCU) to the Dual Port RAM.
  • A faulty Drive Control PCB (A1).

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Perform a DSD 412 power down sequence.

  2. 2

    Replace the Drive Control PCB (A1).

Browse all codes in this manual (48)
Verified technical data. Last updated: April 2026

Related Faults

117/118SERIAL COMMUNICATION FAULT400MOTOR OVERLOAD FAULT401EXCESSIVE FIELD CURRENT
Source: Otis DSD 412 DC Elevator Drive
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