No communication with battery

What does 402 mean?

The Fronius Primo GEN24 208-240 inverter cannot establish communication with the connected battery system. This prevents the inverter from managing battery charging, discharging, and monitoring, rendering the battery inoperable.

• No communication with the battery.
• Wiring fault (e.g. incorrect or loose cable, crossed data lines).
• Battery not powered.
• Incorrect battery address or settings.
• Battery system internal fault.

Click steps to track your progress.

1. 1

   Verify all communication cables between the Fronius Primo GEN24 208-240 inverter and the battery management system (BMS) are correctly wired and securely connected.

2. 2

   Ensure the battery system is powered on and its internal status indicators are normal.

3. 3

   Check the communication settings (e.g., Modbus address, CAN bus settings) in the inverter's user interface to ensure they match the battery system's configuration.

4. 4

   Inspect the communication cable for physical damage or breaks.

5. 5

   Perform a power cycle of both the inverter and the battery system to attempt to re-establish communication. Consult the battery manual for proper shutdown/startup procedure.