Inverter with battery: no communication
Fronius · Primo GEN24
What does 404 mean?
The Fronius Primo GEN24 208-240 inverter, configured to operate with a battery, has lost communication with the battery system. This prevents any battery charging or discharging, effectively disabling the energy storage function.
Common Causes
- 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.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Check all communication cables (e.g., CAN bus, RS485) between the Fronius Primo GEN24 208-240 inverter and the battery management system (BMS) for proper connection and integrity.
- 2
Confirm that the battery system is powered on, not in sleep mode, and its status indicators (LEDs) are normal.
- 3
Verify the communication protocol settings (e.g., CAN ID, Modbus address) within the inverter's interface align with the battery manufacturer's specifications.
- 4
Inspect the communication cable for any physical damage, breaks, or incorrect pinouts.
- 5
Perform a controlled shutdown and restart of both the inverter and the battery system as per their respective manuals to reset communication.