559
Functional incompatibility (PC boards)
Fronius · Solar Energy
What does 559 mean?
This warning indicates that one or more PC boards within the inverter are not compatible with each other. This often occurs after a PC board has been replaced with an incorrect or non-matching version.
Common Causes
- Incompatible PC boards installed in the inverter
- Incorrect PC board replacement
Repair Steps & Checklist
Click steps to track your progress.
- 1
Update the inverter firmware to ensure compatibility across installed PC boards
Verified technical data. Last updated: March 2026
Related Faults
Source: Fronius Solar Energy