Event 404
 Qualified person
Qualified person
Event message:
- Grid incident 
Explanation:
The inverter has disconnected from the utility grid. A stand-alone grid or a very large change in the grid frequency was detected.
Corrective measures:
- Make sure there is no power outage or work being done on the utility grid and contact a grid operator if necessary. 
- Check the grid connection for significant short-term frequency fluctuations.