Fanuc 0i Error Code 431

Fanuc CNC Major Servo Alarm

Model: FANUC Series 0i / 0i Mate | Code: 431

Applicable Systems
Series 0i Series 16/18/21 Alpha Beta

Symptoms

Z axis movement position error is too large.

Possible Causes

  • Servo position deviation exceeds the allowable limit during movement.
  • Excessive load or servo gain mismatch.

Troubleshooting Steps

  1. Step 1: Reduce the load or adjust servo gain parameters.
    Load or gain adjusted.
  2. Step 2: Check encoder feedback for accuracy.
    Feedback verified and alarm cleared.

How to Reset

Fix the deviation cause and reset to clear the alarm.

Related Fanuc Fault Codes

Source: Fanuc 0i/0iMate Alarm Code List, FANUC Corporation

Category: CNC