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LG Error Codes & Troubleshooting
This LG troubleshooting page is designed to help you understand common fault codes and take safe first-step checks before arranging a technician. Use the code list below to match displayed errors with likely system behavior.
For LG units, practical first checks include filter airflow, basic controller reset, and visible drainage condition. Where compressor load, sensor, or refrigerant warnings continue to return, professional testing is the safest way to avoid progressive component damage.
If you need help with your LG unit in Melbourne, our licensed team can provide same-day assessment, repair options, and maintenance guidance to keep your cooling system reliable.
LG Error Codes & Troubleshooting
LG air conditioning systems combine inverter efficiency and smart controls for reliable home comfort.
How to use this troubleshooting guide effectively
Use the exact LG code displayed on the wall controller, then review the symptom guidance listed for that code. Safe first checks include confirming airflow path, restarting the controller, and checking accessible filters. Leave sealed system, gas, and electrical diagnostics to licensed technicians.
If an LG fault keeps recurring after reset, the issue generally needs professional testing rather than repeated restarts. Our Melbourne technicians can verify compressor load, thermistor values, board status, and refrigerant performance before recommending the most cost-effective fix.
Error Code: CH 01
Indoor temperature sensor error
Troubleshooting Steps:
Indoor room thermistor fault detected. Check sensor wiring and replace the sensor if required.
Error Code: CH 02
Indoor coil sensor error
Troubleshooting Steps:
Evaporator pipe thermistor is out of range. Inspect connections and confirm sensor resistance values.
Error Code: CH 05
Communication error
Troubleshooting Steps:
Communication failure between indoor and outdoor units. Check interconnect cable polarity and terminals.
Error Code: CH 09
EEPROM or PCB fault
Troubleshooting Steps:
Control board memory or PCB error. Professional board diagnostics and replacement may be required.
Error Code: CH 10
Indoor fan motor feedback error
Troubleshooting Steps:
Indoor fan motor is not reaching target RPM. Check fan motor, capacitor, and obstruction in blower wheel.
Error Code: CH 21
Compressor overcurrent
Troubleshooting Steps:
Compressor current exceeded safe limits. Turn system off and arrange urgent professional diagnosis.
Error Code: CH 22
Outdoor current sensor error
Troubleshooting Steps:
Current transformer or sensing circuit issue in outdoor unit. Electrical checks are required.
Error Code: CH 38
Low refrigerant detection
Troubleshooting Steps:
System has detected low refrigerant condition. Leak testing and qualified refrigerant recharge are needed.
Still Having Issues with Your LG System?
Our certified technicians are experts in LG air conditioning systems. We provide professional diagnosis, repair, and maintenance services across Melbourne.
Available 24/7 for emergencies
Prevent future faults with routine maintenance
With LG systems, repeated fault activity is frequently associated with filter loading, drainage issues, thermistor deviations, or neglected annual maintenance. Planned servicing supports better efficiency, quieter operation, and fewer urgent repair events.
We recommend a professional service before summer to test performance, clean critical components, and confirm your LG system is operating safely and reliably.