What causes Fronius error 721?

System reset. Internal data corruption or re-initialisation process

How do you fix Fronius fault code 721?

1. Acknowledge the status code on the display

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

EEPROM has been re-initialised

What does 721 mean?

Common Causes

EEPROM has been re-initialised

What does 721 mean?

Common Causes

Repair Steps & Checklist

Related Faults