Siemens SINAMICS G120 Error Code F0020

Siemens PLC & VFD Major Phase Loss

Model: SINAMICS G120 | Code: F0020

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

Symptoms

Mains supply phase loss detected.

Possible Causes

  • Missing input phase
  • Input fuse blown
  • Loose input connection

Troubleshooting Steps

  1. Step 1: Measure all three input phases
    All phases present
  2. Step 2: Check input fuses
    All fuses intact
  3. Step 3: Inspect input connections
    All connections tight

How to Reset

Reset via operator panel after restoring all phases.

Related Siemens Fault Codes

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Source: Siemens SINAMICS G120 List Manual

Category: PLC & VFD