LG Air Conditioner Error Codes List and Fixes
LG Air Conditioner Error Codes List and Fixes (Complete Troubleshooting Guide)
Is your LG air conditioner displaying an error code like CH05, CH10, CH38, or CH67 and not cooling properly?
Modern LG air conditioners and inverter AC systems are equipped with intelligent self-diagnosis technology that automatically detects system faults and displays error codes.
These codes help homeowners and technicians quickly identify problems and prevent major damage to the air conditioner.
In this complete LG AC troubleshooting guide, you will learn:
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Complete LG AC error codes list
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Meaning of each error code
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Possible causes of the problem
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Step-by-step troubleshooting solutions
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DIY vs technician repair difficulty
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Estimated repair cost
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Preventive maintenance tips
Understanding LG AC error codes helps you fix minor problems quickly and avoid expensive repairs.
How LG AC Self-Diagnosis System Works
Modern LG inverter air conditioners use a smart microprocessor control board (PCB) that continuously monitors system performance.
The AC system tracks several parameters including:
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Room temperature sensor
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Evaporator coil temperature
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Outdoor condenser performance
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Compressor current
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Refrigerant pressure
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Indoor and outdoor communication signals
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Fan motor speed
If the system detects an abnormal condition, the AC will automatically:
- Display an error code on the indoor unit display panel
- Stop compressor operation if necessary
- Enter system protection mode
- Prevent damage to major AC components
This protection system safeguards components such as:
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Compressor
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Fan motor
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Sensors
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Refrigerant circuit
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Control board (PCB)
How to Check LG AC Error Codes
Before troubleshooting, confirm the exact error code displayed on your LG AC.
Method 1 – Indoor Unit Display
Most LG split AC models display error codes like CH05, CH10, CH38 directly on the LED display.
Method 2 – LG Smart Diagnosis (ThinQ App)
Some LG smart air conditioners allow error detection through the LG ThinQ mobile app.
Method 3 – LED Indicator Blinking
Older LG AC models indicate faults through blinking LED lights.
Always write down the exact error code before restarting the AC system.
Complete LG Air Conditioner Error Codes List (Updated)
Below are the most common LG split and inverter AC error codes with troubleshooting solutions.
CH01 – Indoor Air Temperature Sensor Error
Meaning
Indoor room temperature sensor malfunction.
Possible Causes
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Sensor damage
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Loose wiring
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PCB error
Solution
Reset the AC and replace the faulty sensor if necessary.
Difficulty Level: Medium
Estimated Cost: ₹1000 – ₹2500
CH02 – Indoor Coil Temperature Sensor Fault
Meaning
Evaporator coil thermistor malfunction.
Common Causes
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Sensor failure
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Wiring problem
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Moisture damage
Troubleshooting
Replace the evaporator coil sensor.
Repair Cost: ₹1500 – ₹3000
CH05 – Indoor and Outdoor Communication Error
Meaning
Communication failure between indoor and outdoor units.
Possible Causes
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Loose communication wiring
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Damaged cable
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PCB malfunction
Solution
Technician should inspect wiring and control boards.
Difficulty Level: High
CH10 – Indoor Fan Motor Fault
Meaning
Indoor fan motor speed abnormal.
Common Causes
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Dust accumulation
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Fan motor capacitor failure
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Wiring damage
Step-by-Step Solution
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Clean AC air filters.
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Check airflow blockage.
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Technician may inspect the fan motor.
Repair Cost: ₹3000 – ₹7000
CH21 – Outdoor Unit Power Module Error
Meaning
Outdoor inverter PCB module malfunction.
Possible Causes
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Voltage fluctuation
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PCB damage
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Electrical surge
Solution
Outdoor PCB inspection or replacement required.
Repair Cost: ₹5000 – ₹15000
CH26 – Compressor Overcurrent Protection
Meaning
Compressor drawing excessive current.
Possible Causes
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Compressor malfunction
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Voltage instability
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Electrical wiring problem
Solution
Turn off the AC and contact a technician immediately.
Difficulty Level: High
CH34 – High Pressure Protection
Meaning
Condenser pressure too high.
Common Causes
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Dirty condenser coil
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Blocked airflow
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Outdoor fan malfunction
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Refrigerant overcharge
Solution
Clean condenser coil and ensure proper ventilation.
CH38 – Refrigerant Shortage
Meaning
Low refrigerant pressure detected.
Possible Causes
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Gas leakage
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Poor installation
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Copper pipe damage
Troubleshooting
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Turn off AC.
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Inspect pipe joints for oil marks.
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Technician performs leak detection and gas refill.
Repair Cost: ₹2000 – ₹6000
CH67 – Outdoor Fan Motor Lock
Meaning
Outdoor fan motor unable to rotate properly.
Causes
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Fan motor failure
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Dust accumulation
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Capacitor damage
Solution
Fan motor inspection and repair required.
Repair Cost: ₹3000 – ₹8000
Quick Reference Table – LG AC Error Codes
| Error Code | Meaning | Main Cause | Difficulty |
|---|---|---|---|
| CH01 | Room sensor error | Thermistor failure | Medium |
| CH02 | Coil sensor fault | Sensor damage | Medium |
| CH05 | Communication error | Wiring issue | High |
| CH10 | Indoor fan motor error | Motor failure | Medium |
| CH21 | Inverter PCB fault | Electrical surge | High |
| CH26 | Compressor overcurrent | Compressor issue | High |
| CH34 | High pressure protection | Dirty condenser | Medium |
| CH38 | Refrigerant shortage | Gas leak | High |
| CH67 | Outdoor fan motor lock | Motor issue | Medium |
Minor vs Major LG AC Error Codes
Minor Errors (DIY Fix Possible)
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CH01
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CH02
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CH10
These errors may resolve after cleaning filters or resetting the AC.
Major Errors (Technician Required)
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CH05
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CH21
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CH26
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CH38
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CH67
These issues involve compressor, refrigerant system, or PCB repair.
Estimated LG AC Repair Cost in India
| Problem | Approx Cost |
|---|---|
| Sensor Replacement | ₹1000 – ₹3000 |
| Gas Refill | ₹2000 – ₹6000 |
| Fan Motor Repair | ₹3000 – ₹8000 |
| PCB Replacement | ₹5000 – ₹12000 |
| Compressor Replacement | ₹10000+ |
Costs vary depending on AC model and city location.
Common Reasons for LG AC Error Codes
Most LG AC errors occur due to:
- Dirty air filters
- Refrigerant leakage
- Voltage fluctuation
- Blocked condenser airflow
- Improper installation
- Lack of regular maintenance
Regular servicing prevents most AC issues.
Preventive Maintenance Tips
To avoid LG AC error codes:
- Clean AC filters every month
- Service AC before summer season
- Keep outdoor condenser clean
- Maintain proper airflow around outdoor unit
- Install voltage stabilizer
- Schedule yearly HVAC inspection
Preventive maintenance can reduce system breakdowns by up to 70%.
When Should You Call a Technician Immediately?
Contact professional service if:
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Compressor related error appears
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AC trips circuit breaker frequently
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Burning smell detected
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Loud abnormal noise occurs
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Refrigerant leak suspected
Never attempt compressor or PCB repair yourself.
Is LG Air Conditioner Reliable?
LG air conditioners are popular worldwide due to:
- Energy-efficient inverter compressors
- Smart connectivity with LG ThinQ
- Durable cooling technology
- Quiet operation
With proper maintenance, an LG air conditioner can last 10–15 years or more.
Frequently Asked Questions (FAQ)
How do I reset my LG air conditioner?
Turn off the main power supply for 5–10 minutes and restart the AC.
What does CH38 mean in LG AC?
CH38 indicates low refrigerant pressure, usually caused by refrigerant leakage.
Why is my LG AC showing CH05 error?
CH05 indicates a communication error between indoor and outdoor units.
Can I fix LG AC sensor errors myself?
You can try resetting the AC, but sensor replacement usually requires a technician.
How long does an LG air conditioner last?
An LG AC typically lasts 10–15 years with proper maintenance.
Final Summary
LG AC error codes help detect problems related to:
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Sensors
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Refrigerant system
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Fan motor operation
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Compressor protection
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PCB communication
Understanding these codes helps you:
- Diagnose AC issues quickly
- Avoid unnecessary repair costs
- Prevent major system breakdowns
- Extend air conditioner lifespan
Minor issues: Try reset and filter cleaning
Major issues: Call HVAC technician immediately
Conclusion
LG air conditioner error codes are intelligent diagnostic alerts designed to protect your AC system from serious damage.
Whether it is CH05 communication error, CH10 fan motor fault, or CH38 refrigerant shortage, early troubleshooting can save both time and repair costs.
Regular maintenance, proper installation, and timely servicing will ensure your LG air conditioner operates efficiently for many years.
If the error persists after resetting the system, always contact a qualified HVAC technician for safe and reliable repair.