403
FIVE-MINUTE FULL FIELD
Otis · DSD 412 Elevator System
What does 403 mean?
This fault indicates that the Drive and Field Enable control circuit at terminal TB1-9 remained active for five minutes without the drive commencing operation. This condition can lead to burnout of the motor field winding.
Common Causes
- Issue with the car controller relay logic, incorrectly keeping the Drive and Field Enable active without a start command.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Check the car controller relay logic to ensure that the Drive and Field Enable signal at TB1-9 is not continuously active for prolonged periods without the drive being started.
Verified technical data. Last updated: March 2026
Related Faults
Source: Otis DSD 412 Elevator System