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
Replace the Drive Control PCB, A1.
Verified technical data. Last updated: March 2026
Related Faults
Source: Otis DSD 412 Elevator System