117/118
SERIAL COMMUNICATION FAULT
Otis · DSD 412 Elevator System
What does 117/118 mean?
Code 117 indicates serial communication did not start within 10 seconds after drive reset or power-up. Code 118 indicates a valid serial communication message was not received for more than 150 ms.
Common Causes
- Host not connected or not sending valid messages.
- Electrical grounding noise interference.
- Parameter #110 set to selection 3 when serial communication is not being used.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Ensure the host is connected and sending valid messages.
- 2
Identify and correct electrical grounding noise interference problems.
- 3
If serial communication is not being used, verify parameter #110 is NOT set to selection 3.
Verified technical data. Last updated: March 2026
Related Faults
Source: Otis DSD 412 Elevator System