117/118

SERIAL COMMUNICATION FAULT

Otis · DSD 412 DC Elevator Drive

What does 117/118 mean?

Fault 117 occurs if serial communication does not start within 20 seconds after drive reset or power up. Fault 118 occurs if a valid serial communication message is not received for more than 150 milliseconds.

Common Causes

  • Host system is not connected or not sending valid messages.
  • Electrical grounding noise interference.
  • Serial communication is not being used, but parameter #110 is set to selection 3.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure that the host is connected and sending valid messages.

  2. 2

    Look for and correct electrical grounding noise interference problems.

  3. 3

    If serial communication is not being used, verify that parameter #110 is NOT set to selection 3.

Browse all codes in this manual (48)
Verified technical data. Last updated: March 2026

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Source: Otis DSD 412 DC Elevator Drive