F01665

System is defective

Siemens · SINAMICS G120 Safety Functions

What does F01665 mean?

The inverter has detected a critical internal defect, which could be a hardware failure, persistent software issue within the Control Unit, or an unconfigured 'STO via Power Module terminals' with active terminals. This compromises system integrity and requires immediate attention to prevent operational failure.

Complete Troubleshooting Guide

  1. 1

    Cycle the power supply of the Control Unit (off then on).

  2. 2

    If the fault persists, contact Technical Support.

  3. 3

    If 'STO via Power Module terminals' is not configured but terminals are active, set the fail-safe digital input switches (STO_A and STO_B) on the Power Module to 'OFF'.

Source: Siemens Manual