721
EEPROM has been re-initialised
Fronius · Solar Energy
What does 721 mean?
The EEPROM (Electrically Erasable Programmable Read-Only Memory) has been re-initialised, possibly due to a reset or an internal event. A warning message is shown on the display.
Common Causes
- System reset
- Internal data corruption or re-initialisation process
Repair Steps & Checklist
Click steps to track your progress.
- 1
Acknowledge the status code on the display
Verified technical data. Last updated: March 2026
Related Faults
Source: Fronius Solar Energy