457 Grid relay stuck - Internal relay malfunction.

What does 457 mean?

The inverter's internal grid relay is stuck, preventing it from feeding energy into the grid. This is a hardware fault and the inverter will not operate safely.

• Mechanical failure of the grid relay.
• Internal hardware fault.

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

   Listen for any clicking sounds from the relay trying to engage or disengage.

3. 3

   If this status code persists, contact a Fronius-trained service technician, as this requires internal component replacement.