209
TagID Defective EEPROM Memory
Fronius · Perfect Charging
What does 209 mean?
The EEPROM (Electrically Erasable Programmable Read-Only Memory) within the TagID module is detected as defective. EEPROM is used for non-volatile storage of critical configuration and master data, so this fault affects the persistence of information.
Common Causes
- Physical degradation or wear of the EEPROM memory cells over time or due to excessive write cycles.
- Power disturbances or unstable voltage supply affecting EEPROM write operations.
- An internal fault of the TagID module's memory controller.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Attempt to rewrite or reformat the EEPROM memory if diagnostic tools allow, or try to restore default settings.
- 2
If the EEPROM is physically defective and integrated, the entire TagID module requires replacement.
- 3
Check the stability of the power supply to the TagID module.
Verified technical data. Last updated: March 2026
Related Faults
Source: Fronius Perfect Charging