Cause : Firmware version out of date - comes when the Control Unit firmware is too old. If you're receiving a notification that the firmware version of your Siemens G120 drive is out of date, it's important to update it to ensure optimal performance, compatibility.

Re fault value = 1, 2, 4:
- Upgrade the firmware of the Control Unit. For fault value = 3:
- Upgrade the firmware of the Control Unit.
- Replace the Power Module by a component that is supported.