414
SOFTWARE COMPATABILITY FAULT
Otis · DSD 412 DC Elevator Drive
What does 414 mean?
The PCU (U13, U14) version and/or revision is incompatible with the DCU (U39, U40) installed in the drive. This typically indicates a mismatch in EPROM versions.
Common Causes
- Incompatible PCU (U13, U14) software/revision with DCU (U39, U40).
- Incorrect ROMs (U13, U14, U39, U40) installed in the drive.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Check and/or replace U13, U14, U39, U40 (EPROM’s) to ensure compatibility.
- 2
Replace Drive Control PCB A1 if necessary.
Verified technical data. Last updated: March 2026
Related Faults
Source: Otis DSD 412 DC Elevator Drive