LG Dual Inverter Window ACs are known for their high energy efficiency, fast cooling, and quiet operation. But like any modern appliance, they come equipped with a self-diagnostic system that displays error codes when something goes wrong.

This built-in system is helpful — it saves you time, identifies issues instantly, and often points to a quick fix. Below is a detailed list of LG Dual Inverter Window AC error codes, what each one means, and how to fix them.

📋 LG Dual Inverter Window AC Error Codes: Description & Fixes

CH01 – Room Temperature Sensor Error

• Description: The sensor that detects room temperature is faulty or disconnected.
• Solution:
  • Power off and restart the unit.
  • Check sensor wiring for disconnection or damage.
  • Replace the sensor if it doesn’t work.

CH02 – Indoor Pipe Temperature Sensor Error

• Description: The indoor coil temperature sensor is not working correctly.
• Solution:
  • Ensure the sensor is properly positioned on the pipe.
  • Clean the coil and check wiring.
  • Replace the sensor if the error persists.

CH03 – Outdoor Pipe Temperature Sensor Error

• Description: The sensor on the outdoor unit pipe is malfunctioning.
• Solution:
  • Check wiring and connector terminals.
  • Replace the outdoor sensor if needed.
  • Call a technician for outdoor unit diagnosis.

CH05 – Communication Error Between Indoor and Outdoor Unit

• Description: The indoor unit isn’t able to communicate with the outdoor unit.
• Solution:
  • Turn off the power for 5 minutes and restart.
  • Check for any cut or loose wiring between units.
  • If issue persists, call LG service for PCB inspection.

CH06 – Indoor Fan Motor Malfunction

• Description: Fan motor isn’t running or is running irregularly.
• Solution:
  • Clean the fan and check for obstructions.
  • Test fan capacitor and wiring.
  • Replace motor if defective.

CH09 – EEPROM/Memory Error

• Description: The AC’s main board memory is corrupted or unreadable.
• Solution:
  • Try resetting the AC.
  • If error returns, control board replacement is required.

CH10 – Discharge Temperature Error

• Description: Compressor discharge temperature is abnormally high.
• Solution:
  • Clean filters and coils.
  • Ensure outdoor unit is not blocked.
  • Technician should check refrigerant levels and compressor condition.

CH38 – Low Refrigerant / System Pressure Issue

• Description: Indicates low refrigerant or a leak in the system.
• Solution:
  • Turn off the AC and avoid using until repaired.
  • Schedule service to check and refill refrigerant gas.
  • Repair any detected leaks in the copper piping.

🧰 Tips to Prevent LG Dual Inverter AC Errors

• 🧼 Clean the air filters every 2 weeks.
• ⚡ Use a voltage stabilizer to protect from power fluctuations.
• 📅 Service the AC every 6 months for optimal performance.
• 🌬️ Make sure the outdoor unit is placed in a well-ventilated area.
• 🛑 Avoid running the AC with open doors/windows to prevent system strain.

🧑‍🔧 When to Call LG Customer Support

Contact LG service if:

• An error persists after restarting the unit.
• You see multiple codes at once.
• Cooling is significantly reduced or stops.
• Unusual noise, smells, or water leakage occur.

You can reach LG support via the LG SmartThinQ app, website, or toll-free number.

🏁 Final Thoughts

Error codes in your LG Dual Inverter Window AC are designed to help you act fast. From minor sensor issues to refrigerant problems, understanding these codes can save you time, energy, and costly repairs.

Tackle simple errors yourself, and always rely on professionals for complex ones to avoid damaging the unit.

---