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LG Energy Solution•RESU 10H

Analysis by Marcus & Team

LG RESU 10H Error Code 23 Troubleshooting

Troubleshooting LG RESU 10H Error Code 23. Diagnose and fix battery communication errors in residential energy storage systems. Ensure safe operation.

Frequently Asked Questions

•What does Error Code 23 on my LG RESU 10H mean?

Error Code 23 indicates a communication problem between the battery and the inverter. It means the inverter isn't receiving data from the battery.

•Can I fix Error Code 23 myself?

While you can check for loose cables, resolving Error Code 23 often requires a qualified electrician due to the high DC voltages and complex communication protocols involved.

•How do I find a qualified technician for my LG RESU 10H?

Contact LG Energy Solution or a certified solar installer in your area. They can provide a list of qualified technicians experienced with LG RESU battery systems.

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Marcus leads the technical research department at Storage Faults. Together with a team of systems analysts, he specializes in translating complex solar storage error codes into actionable diagnostic steps for the US market.

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Technical Background:

The LG RESU 10H communicates with the inverter using a CAN bus protocol. The BMS monitors cell voltages, temperature, and current, and relays this information to the inverter. Error 23 typically arises from a disruption in this communication link. The battery pack consists of multiple Li-ion cells connected in series and parallel, managed by the BMS for optimal performance and safety. The DC voltage from the battery is converted to AC by the inverter for household use or grid export.

Critical Safety Precautions:

Lithium-ion batteries store significant energy and pose a fire risk if mishandled. Never attempt to disassemble or repair the battery pack yourself. High DC voltages are present in the system and can cause severe electrical shock or death. Always de-energize the system before working on any components and verify zero voltage using a calibrated multimeter. Only qualified electricians should perform repairs or maintenance on the LG RESU 10H system. Ensure compliance with all applicable NEC codes and local regulations.

Solution:

1

Safely disconnect the AC and DC power to the LG RESU 10H system following NEC 706.15 rapid shutdown requirements. Use a calibrated multimeter to verify zero voltage at the DC disconnect.
2

Inspect all communication cables between the battery and the inverter for damage, loose connections, or corrosion. Use a cable tester to verify cable integrity.
3

Check the DC voltage of the battery using a multimeter. If the voltage is significantly lower than the nominal voltage (around 51.8V), the battery may be deeply discharged and require licensed technician recovery.
4

Consult the inverter and LG RESU 10H manuals for specific troubleshooting steps related to Error Code
5

Check for firmware updates for both the inverter and the BMS. Follow manufacturer instructions precisely for updating firmware.
6

If possible, use a CAN bus analyzer to monitor communication between the battery and the inverter. This can help identify the source of the communication failure.
7

If the above steps do not resolve the issue, contact a qualified electrician or LG Energy Solution service technician for further diagnosis and repair.
8

Ensure the qualified technician verifies proper grounding and bonding according to NEC Article 250.

Why This Happens:

Loose or damaged communication cables between the battery and the inverter.
Corrupted firmware on the BMS or inverter.
CAN bus communication failure due to noise or interference.
BMS malfunction preventing proper data transmission.
Inverter communication port failure.
Low DC voltage on the battery preventing BMS operation.

Prevention:

Schedule annual system inspections by a qualified electrician
This includes checking cable connections, monitoring battery health (SOC and SOH), and ensuring proper ventilation around the battery
Perform routine firmware updates on both the inverter and the BMS as recommended by the manufacturer
Periodically test the battery's backup power capability to ensure it can provide the expected runtime
Review historical performance data from the monitoring app to identify any potential issues early on