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ErrorLib — Industrial Fault Code Library

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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. 1

    Replace the detection circuit component within the sensor (serial).

Browse all codes in this manual (38)
Verified technical data. Last updated: April 2026

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Source: Fanuc Series 30i/31i/32i-MODEL B Plus
Open Manual (Page 127)Search more codes in this manual