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Fault codes › Fronius › Fronius Symo UL (10.0-3 to 24.0-3 208-240/480)

Fronius Symo 721

Code
721
Shown as
EEPROM was reinitialized
Vendor severity
Class 7
ID
fc:fronius-symo-721
IRI
https://solarlattice.org/kb/fc/fronius-symo-721
Status
active
Also known as
721, Fronius 721, EEPROM was reinitialized
Category
Inverters
Class warning drafted · lead
Production not stated
Clears after a manual reset verified · fact

Decoded

Reports internal memory error.

What can be behind Internal memory error

Failure modes that present as the reported condition, and the tests that tell them apart.

Defined in

The manufacturer's own cause and corrective text is not reproduced here.

Same condition on other equipment

ABB / FIMER
ABB / FIMER PVS-166-175-TL E051, ABB / FIMER PVS-60-TL E051
Canadian Solar
Canadian Solar 23-28KTL-CT EepromErr
Fronius
Fronius Galvo 721, Fronius Primo 461, Fronius Primo 721, Fronius Symo 461, Fronius Symo 772
KACO new energy
KACO new energy blueplanet TL3 128, KACO new energy blueplanet TL3 148, KACO new energy blueplanet TL3 207, KACO new energy blueplanet TL3 208, KACO new energy blueplanet TL3 209
SMA
SMA SC-CP-XT 6113
Yaskawa Solectria
Yaskawa Solectria PVI-14-20TL EepromErr, Yaskawa Solectria PVI-TL EepromErr

Same code in other families

Claims

defined_in

c1 drafted · lead fronius-symo-ul-emanual-status-codes

reports

c2 drafted · lead Internal memory error

EEPROM was reinitialized, or may be defective.

has_event_class

c3 drafted · lead Warning (device continues, a condition is flagged)

has_recovery

c4 verified · fact Manual reset (operator restarts or acknowledges)

Operator acknowledges first; contact a trained service technician if the code persists.

verified by: review-workflowverified on: 2026-10-23

applies_to

c5 drafted · lead Fronius Symo

Data