445
Compatibility error / Invalid power stage set configuration
Fronius · Solar Energy
What does 445 mean?
This code indicates either a compatibility error, such as after a PC board replacement, or an invalid configuration of the power stage set. This prevents the inverter from feeding energy into the grid.
Common Causes
- Incompatible PC board replacement
- Invalid power stage set configuration
Repair Steps & Checklist
Click steps to track your progress.
- 1
Update the inverter firmware
Verified technical data. Last updated: March 2026
Related Faults
Source: Fronius Solar Energy