721 EEPROM reinitialized or defective - Internal memory issue.

What does 721 mean?

A warning message appears on the display, indicating that the inverter's EEPROM (internal memory) was either reinitialized or is defective. This can affect system configuration and data.

• Corruption or failure of the inverter's internal EEPROM memory.
• An intentional reinitialization of EEPROM.

Click steps to track your progress.

1. 1

   Acknowledge the status code on the inverter's display.

2. 2

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

3. 3

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