Siemens SINAMICS G120 Error Code F31159

Siemens PLC & VFD Major Encoder

Model: SINAMICS G120 | Code: F31159

Applicable Systems
S7-1200 S7-1500 S7-300 S7-400 LOGO! SINAMICS

Symptoms

Encoder signal distortion: encoder waveform degraded.

Possible Causes

  • Signal interference
  • Encoder sensor contamination
  • Encoder cable damage

Troubleshooting Steps

  1. Step 1: Check signal with oscilloscope
    Waveform clean
  2. Step 2: Clean encoder sensor
    Sensor clean
  3. Step 3: Replace encoder cable if damaged
    Cable intact

How to Reset

Reset via operator panel after encoder signal is clean.

Related Siemens Fault Codes

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Source: Siemens SINAMICS G120 List Manual

Category: PLC & VFD

Published: 2026-10-02