Fronius Hybrid Inverter State LED lights up red — General bus error (system error 10)

What does State LED Red (Hybrid Inverter) mean?

The red 'State' LED on the Fronius hybrid inverter is lit continuously, indicating a general bus error (system error 10). This means there's a problem with the internal communication system of the inverter.

• Internal communication bus fault
• Hardware malfunction within the inverter
• Software error

Click steps to track your progress.

1. 1

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

2. 2

   Perform a full AC and DC power cycle of the inverter: Disconnect both AC and DC power, wait 5 minutes, then reconnect.

3. 3

   If the red LED remains lit, contact a Fronius-trained service engineer for diagnosis and repair.