Grid fault (Frequency Fluctuation)

What does 401/404 mean?

The inverter has disconnected from the utility grid because a stand-alone grid was detected or a very large, short-term change in the power frequency occurred. This disconnection is a protective measure.

• Detection of a stand-alone grid (islanding condition).
• Significant short-term fluctuations in the power frequency.

Click steps to track your progress.

1. 1

   Check the grid connection for significant short-term frequency fluctuations.