Siemens SINAMICS G120 Error Code F0004

Siemens PLC & VFD Major Overtemperature

Model: SINAMICS G120 | Code: F0004

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

Symptoms

Inverter overtemperature: power module too hot.

Possible Causes

  • Cooling fan failure
  • Power module clogged
  • Ambient temperature too high

Troubleshooting Steps

  1. Step 1: Check cooling fan operation
    Fan running at rated speed
  2. Step 2: Clean power module heatsink
    Heatsink clean
  3. Step 3: Reduce ambient temperature
    Temperature within rated range

How to Reset

Reset via operator panel after temperature normalizes.

Related Siemens Fault Codes

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Source: Siemens SINAMICS G120 List Manual

Category: PLC & VFD

Published: 2026-10-12