403
FIVE-MINUTE FULL FIELD
Otis · DSD 412 DC Elevator Drive
What does 403 mean?
The Drive and Field Enable control circuit at TB1-9 was active for 5 minutes without the drive starting. This condition can cause motor field burnout.
Common Causes
- Drive and Field Enable control circuit at TB1-9 active for 5 minutes without a drive start command.
- Issues with car controller relay logic preventing a drive start.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Check the car controller relay logic to ensure proper drive start sequencing.
- 2
Verify the state of the Drive and Field Enable control circuit at TB1-9.
- 3
Ensure the drive is commanded to start within 5 minutes when Drive and Field Enable is active, or disable the enable signal if the drive is not intended to start.
Verified technical data. Last updated: March 2026
Related Faults
Source: Otis DSD 412 DC Elevator Drive