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
Ensure that the host is connected and sending valid messages.
- 2
Look for and correct electrical grounding noise interference problems.
- 3
If serial communication is not being used, verify that parameter #110 is NOT set to selection 3.
Verified technical data. Last updated: March 2026
Related Faults
Source: Otis DSD 412 DC Elevator Drive