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. 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.

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Verified technical data. Last updated: March 2026

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Source: Otis DSD 412 Elevator System