DC component measured in the grid too high

What does 408 mean?

This code indicates that an excessively high DC current component has been measured in the AC grid. Such a condition can indicate a fault within the inverter's power conversion stages or an external grid disturbance, typically causing the inverter to disconnect for safety.

• Internal fault within the inverter causing DC current injection into the AC grid.
• Malfunction of grid monitoring relays or sensors detecting DC components.
• Fault in the inverter's output filter or control.

Click steps to track your progress.

1. 1

   If the status code is displayed continuously, notify a Fronius-trained service engineer for diagnosis and repair.

2. 2

   Perform an AC reset to cycle the inverter and clear transient measurement errors.

3. 3

   Verify grid connection integrity and absence of external DC injection sources.