Error 4 (Binary 0100) — Fieldbus hardware fault

What does 4 mean?

The Fronius Solar Inverter has detected a hardware fault related to its fieldbus communication system. This is indicated by LEDs 1, 2, 4, 8, and the State LED all lighting up steady red, with LED 4 specifically illuminated for the binary code.

• Damaged fieldbus components
• Loose fieldbus connections

Click steps to track your progress.

1. 1

   Observe the inverter for a few minutes to see if the error clears automatically.

2. 2

   Carefully check all fieldbus cable connections to ensure they are secure and undamaged.

3. 3

   If the error persists, contact a Fronius-trained service engineer for diagnosis.