906

DCU FAILURE FAULT

Otis · DSD 412 Elevator System

What does 906 mean?

The update of the Dual Port RAM from the Drive Control Unit (DCU) is unreliable. This fault will shut down the drive and requires a DSD 412 power down before attempting corrective actions.

Common Causes

  • Faulty Drive Control PCB, A1.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Replace the Drive Control PCB, A1.

Browse all codes in this manual (57)
Verified technical data. Last updated: March 2026

Related Faults

Source: Otis DSD 412 Elevator System