601
CAN bus is full
Fronius · Solar Energy
What does 601 mean?
The CAN (Controller Area Network) bus transmit buffer is full, indicating a communication issue within the inverter. This prevents the inverter from feeding any energy into the grid.
Common Causes
- Excessive CAN bus traffic
- Communication fault on the CAN bus
- Software or hardware issue causing buffer overflow
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