d9
Sensor (serial) inner circuit error
Fanuc · Series 30i/31i/32i-MODEL B Plus
What does d9 mean?
An error has occurred in the inner circuit of the serial sensor, indicating an abnormality specifically within its detection circuit. This internal failure means the sensor is unable to correctly provide feedback data.
Common Causes
- Detection circuit of the serial sensor is abnormal
Repair Steps & Checklist
Click steps to track your progress.
- 1
Replace the detection circuit component within the sensor (serial).
Verified technical data. Last updated: March 2026
Related Faults
Source: Fanuc Series 30i/31i/32i-MODEL B Plus