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. 1

    Update the inverter firmware

Browse all codes in this manual (60)
Verified technical data. Last updated: March 2026

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