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. 1

    Acknowledge the status code on the display

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Verified technical data. Last updated: March 2026

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