LG Window Inverter AC Error Code List: Meaning, Description & Quick Fixes
LG’s Window Inverter ACs are a popular choice for energy-efficient cooling, thanks to their smart inverter technology, powerful performance, and compact design. However, like all modern appliances, LG inverter ACs are equipped with a self-diagnostic system that displays error codes when something goes wrong.
In this blog, we’ll cover the most common LG Window Inverter AC error codes, their meanings, and practical solutions so you can troubleshoot your AC like a pro.
📋 LG Window Inverter AC Error Code List (With Descriptions & Solutions)
CH01 – Room Temperature Sensor Error
- Description: The indoor temperature sensor is faulty or disconnected.
- Solution:
- Restart the AC.
- Check sensor wiring for any loose or broken connections.
- Replace the sensor if it’s damaged.
CH02 – Indoor Pipe Sensor Error
- Description: The sensor that reads coil temperature is malfunctioning.
- Solution:
- Inspect the pipe sensor connection.
- Clean or replace the sensor if readings are inaccurate or missing.
CH03 – Outdoor Pipe Sensor Error
- Description: The sensor on the outdoor coil is not reading temperature correctly.
- Solution:
- Ensure the sensor is properly mounted and connected.
- Replace if it’s physically damaged.
CH04 – Outdoor Discharge Sensor Error
- Description: The discharge pipe sensor is not functioning or reading high/low incorrectly.
- Solution:
- Check wiring and mount position.
- Replace the sensor if found faulty.
CH05 – Communication Error Between Indoor & Outdoor Units
- Description: Data communication between indoor and outdoor PCBs has failed.
- Solution:
- Turn off the main power and restart after 5 minutes.
- Check interconnecting wires and terminals.
- If issue persists, the PCB may need replacement.
CH06 – Indoor Fan Motor Malfunction
- Description: The indoor fan is not spinning or speed is abnormal.
- Solution:
- Remove dust or blockages from the fan.
- Check motor capacitor and wiring.
- Replace the motor if it does not operate.
CH09 – EEPROM/Memory Error
- Description: A fault in the control board’s memory chip.
- Solution:
- Reset the AC by turning off power completely.
- If the issue continues, indoor PCB replacement may be required.
CH10 – Outdoor Fan Motor Error
- Description: The outdoor fan motor is malfunctioning.
- Solution:
- Clean fan blades and check motor for signs of damage.
- Replace the fan motor if non-functional.
CH38 – Low Refrigerant / Abnormal Pressure
- Description: Refrigerant level is too low, or abnormal pressure is detected.
- Solution:
- Turn off the unit and avoid running it continuously.
- Call a technician to check refrigerant pressure and refill if needed.
- Check for leaks in the refrigerant circuit.
✅ Pro Tips to Prevent LG AC Errors
- 🧼 Clean filters every 2 weeks to maintain airflow.
- ⚡ Use a voltage stabilizer to protect from surges.
- 💧 Check drainage regularly to prevent overflow.
- 📆 Schedule yearly servicing by an authorized LG technician.
- 🚫 Don’t ignore blinking lights or repeated beeping.
📞 When to Call an LG Technician
You should contact professional support if:
- The same error reappears after resetting.
- You notice poor cooling, loud noises, or water leakage.
- The unit is turning on and off unexpectedly.
- You’re unsure how to handle internal components like sensors or PCBs.
✅ Final Thoughts
Understanding the LG Window Inverter AC error code list helps you diagnose problems early and prevent bigger issues down the line. While you can resolve some errors with basic checks and resets, sensor or compressor-related problems are best left to LG-certified service technicians.
Don’t Let an AC Error Freeze Your Comfort – Fix It Fast with These Must-Have Tools & Accessories! ❄️
🔧 AC Repair Tools & Diagnostic Equipment
1. Digital Multimeter – Useful for checking voltage and diagnosing AC issues.
2. AC Gas Leak Detector – For users suspecting refrigerant issues.
3. Fin Comb / Coil Cleaner Brush – Helps in cleaning AC coils.
🧼 AC Cleaning & Maintenance Products
4. AC Coil Cleaner Spray – Helps users self-service their ACs.
5. Split AC Cleaning Cover Kit – For cleaning indoor AC units without mess.
6. Vacuum Pump for AC – For serious DIYers working on gas refilling or servicing.
🔌 Replacement Parts & Accessories
7. AC Remote (Universal / Voltas-specific) – If the remote is malfunctioning.
8. AC Capacitors – For users who diagnosed faulty capacitors.
9. Thermistors or Temperature Sensors – Common cause for some error codes.
🔒 Surge Protectors & Stabilizers
10. AC Voltage Stabilizer – Helps prevent voltage fluctuation issues.
11. Power Surge Protector – To avoid error codes due to electrical surges.
🧊 Portable Cooling Alternatives
12. Portable Air Coolers – As a stop-gap when AC is not working.
13. Rechargeable Mini USB Fans – Budget cooling while waiting for repair.