443 Intermediate circuit voltage too low or unsymmetrical - Internal voltage issue preventing power feed.

What does 443 mean?

The inverter is detecting that its intermediate circuit voltage is either too low or unsymmetrical, which prevents it from feeding energy into the grid.

• Problem with the DC input from the solar panels.
• Internal power supply issue.
• Internal component failure.

Click steps to track your progress.

1. 1

   Perform an AC reset by switching the automatic circuit breaker for the inverter off and then on again.

2. 2

   Observe if the inverter attempts to reconnect and clear the status code.

3. 3

   If this status code persists, contact a Fronius-trained service technician.