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ErrorLib — Industrial Fault Code Library

Disclaimer: ErrorLib is an independent technical reference tool. While we aim for accuracy, always verify with the manufacturer’s official service manuals before performing maintenance on industrial equipment. ErrorLib is not affiliated with the brands listed.

383

PULSE MISS(EXT)

Fanuc · Series 30i/31i/32i-MODEL B Plus

What does 383 mean?

This external alarm indicates a small internal signal amplitude from the separate detector, usually caused by the detector's failure. A weak signal can lead to unreliable position feedback.

Common Causes

  • Small internal signal amplitude from the separate detector
  • Separate detector failure

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Replace the detector.

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 159)Search more codes in this manual