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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.

43

Encoder fault

Vacon · NX Liquid-Cooled Drive

What does 43 mean?

A problem has been detected in the encoder signals. Subcodes in T.14 specify the issue: S1 (Encoder 1 channel A missing), S2 (Encoder 1 channel B missing), S3 (Both encoder channels missing), S4 (Encoder reversed), S5 (Encoder board missing), S6 (Serial communication fault), S7 (Channel A/B mismatch), S8 (Resolver/Motor pole pair mismatch), or S9 (Missed start angle).

Common Causes

  • Encoder signal loss or corruption.
  • Encoder connection faulty or disconnected.
  • Encoder power supply out of range.
  • Encoder internal fault detected.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check all encoder channel connections at both the drive's input terminals and the encoder itself for integrity and proper signal transmission.

  2. 2

    Inspect the encoder board for correct seating within its slot and any signs of physical damage.

Browse all codes in this manual (52)
Verified technical data. Last updated: April 2026

Related Faults

1Overcurrent10Input Phase Failure12Brake Chopper Supervision Fault
Source: Vacon NX Liquid-Cooled Drive
Open Manual (Page 155)Search more codes in this manual