Error 9 (Binary 1001) — RS timeout

What does 9 mean?

The Fronius Solar Inverter has experienced a timeout during RS (serial) communication, meaning it did not receive a response within an expected timeframe. This is indicated by LEDs 1, 2, 4, 8, and the State LED all lighting up steady red, with LEDs 1 and 8 specifically illuminated for the binary code.

• Communication cable fault
• Disconnected device
• Incorrect communication settings

Click steps to track your progress.

1. 1

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

2. 2

   Check all RS communication cables for secure connections and damage.

3. 3

   If the error persists, contact a Fronius-trained service engineer to check communication settings and troubleshoot the connected device.