E18
Garo
PV / Smart Energy Integration Communication Fault
E18 error; charger indicates solar / PV integration fault (if configured).
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Disconnected Modbus cable to PV inverter or energy meter, Incorrect Modbus ID or baud rate, Faulty Garo energy management interface, Damaged communication port on inverter/meter
How to Fix / Troubleshooting
Safety first: Turn off power to both charger and any external energy meters before working on communication wiring.
- Check wiring: Verify that the RS‑485/Modbus cable between the Garo charger and the PV inverter or energy meter is correctly connected and not damaged.
- Confirm settings: In the installer menu, ensure that Modbus address, baud rate, and protocol match the external device's configuration.
- Test external device: Use another Modbus master (if available) to confirm that the inverter or meter responds correctly.
- Inspect interface module: If the charger uses a separate Garo energy management interface, check its LEDs and connections. Replace if unresponsive.
- Fallback mode: Temporarily disable PV‑optimized charging and run in standard mode until communication is restored.
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Repair Difficulty
Medium
3/5
Required Part
Energy Management / Modbus Interface Module
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