LG Air Conditioners Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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CH01
Indoor unit displays CH01 and will not operate or stops shortly after starting.
Indoor Air Thermistor (Room Temperature Sensor) Fault
CH02
Indoor unit displays CH02 and refuses to start or stops intermittently.
Indoor Pipe (Evaporator Coil) Thermistor Fault
CH03
Indoor unit shows CH03 and may not respond to remote commands or may shut down unexpectedly.
Outdoor Pipe Thermistor Fault
CH04
Indoor display shows CH04 and the unit may not start or may shut down shortly after starting.
Drain Pump or Drain Level Sensor Fault (Indoor Unit)
CH05
Indoor unit displays CH05 and does not respond, or outdoor unit does not start.
Communication Error Between Indoor and Outdoor Units
CH06
Indoor unit shows CH06 and may stop cooling or heating.
Outdoor Air Thermistor Fault
CH09
Indoor unit displays CH09 and may not cool or heat properly.
Indoor Fan Motor or Fan Feedback Fault
CH10
Indoor unit shows CH10 and may not operate or may shut down shortly after starting.
Indoor Fan Motor Lock or Overload
CH21
Outdoor unit or indoor display shows CH21 and the system will not run or stops quickly.
DC Peak (Overcurrent) Error in Outdoor Inverter Circuit
CH22
System displays CH22 and will not start or stops during operation.
DC Link Overvoltage Error
CH23
System shows CH23 and does not operate or shuts down.
DC Link Undervoltage Error
CH24
System displays CH24 and stops operating, often during heavy load or high ambient temperature.
High-Pressure Protection (Refrigerant System Overpressure)
CH25
System shows CH25 and stops cooling or heating.
Low-Pressure Protection (Refrigerant System Underpressure)
CH26
System displays CH26 and shuts down, often shortly after startup.
Discharge Pipe High Temperature Protection
CH27
System shows CH27 and will not operate normally.
Inverter Module Overheating (IPM Overheat Protection)
CH28
System displays CH28 and stops operating.
Current Sensor Error (Outdoor Unit)
CH29
System shows CH29 and will not run or cycles off quickly.
DC Compressor Position or Speed Error
CH32
System displays CH32 and may not start or may shut down during operation.
Outdoor Unit Capacity or Model Mismatch / EEPROM Error
CH33
System shows CH33 and stops operation.
Refrigerant Cycle Abnormality (Protection Control)
CH34
System displays CH34 and shuts down, often during extreme temperatures or heavy load.
Safety Shutdown / Abnormal Operation Protection
CH38
System shows CH38 and will not cool or heat properly.
Refrigerant Charge / Cycle Error (Inverter Protection)
CH41
Indoor unit displays CH41 and may not operate correctly.
Indoor EEPROM or Configuration Error
CH44
System shows CH44 and may not respond to remote commands.
Indoor-Outdoor Option or Capacity Mismatch
CH45
System displays CH45 and operation is restricted or stopped.
Communication Error with Optional Accessories (e.g., Central Controller, Wi-Fi Module)
CH46
System shows CH46 and may not operate normally.
Refrigerant Distribution or Multi-Split Port Error
CH60
Indoor unit displays CH60 and heating performance is poor or stopped (heat pump models).
Defrost Sensor or Defrost Cycle Error
Symptom
Burning, electrical, or chemical smell from indoor or outdoor unit.
Electrical Overheating or Component Failure
Symptom
Indoor unit blows air but there is no cooling (room temperature does not drop).
Loss of Cooling Capacity
Symptom
Indoor unit does not power on at all (no lights, no response to remote).
No Power to Indoor Unit
Symptom
Indoor unit emits a musty or moldy odor when operating.
Biological Growth on Indoor Coil or Drain Pan
Symptom
Indoor unit frequently turns on and off (short cycling) without reaching set temperature.
Short Cycling / Improper Capacity Control
Symptom
Indoor unit makes loud rattling, buzzing, or grinding noises during operation.
Indoor Mechanical Noise / Fan or Panel Vibration
Symptom
Indoor unit powers on but compressor and outdoor fan do not start (only fan runs inside).
Outdoor Unit Not Starting
Symptom
Indoor unit runs but airflow is very weak even at high fan speed.
Reduced Indoor Airflow
Symptom
Outdoor unit fan runs but compressor does not start; no cooling.
Compressor Start Failure
Symptom
Outdoor unit is very noisy (grinding, squealing, or loud vibration).
Outdoor Mechanical Noise / Fan or Compressor Vibration
Symptom
Remote control does not operate the indoor unit (no response, but unit can be controlled from panel if available).
Remote Control or IR Receiver Failure
Symptom
Unit displays correct temperature but actual room temperature is much higher or lower.
Temperature Sensing / Calibration Error
Symptom
Unit trips the circuit breaker when starting or shortly after.
Overcurrent / Electrical Short
Symptom
Water dripping from the indoor unit front panel or onto the wall/floor.
Indoor Unit Water Leak (Condensate Drain Problem)
Symptom
Water pooling around the outdoor unit or dripping excessively from connections.
Outdoor Unit Water Leak / Condensate or Defrost Drainage Issue
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| CH01 |
Indoor unit displays CH01 and will not operate or stops shortly after starting.
|
Indoor Air Thermistor (Room Temperature Sensor) Fault | View Details |
| CH02 |
Indoor unit displays CH02 and refuses to start or stops intermittently.
|
Indoor Pipe (Evaporator Coil) Thermistor Fault | View Details |
| CH03 |
Indoor unit shows CH03 and may not respond to remote commands or may shut down unexpectedly.
|
Outdoor Pipe Thermistor Fault | View Details |
| CH04 |
Indoor display shows CH04 and the unit may not start or may shut down shortly after starting.
|
Drain Pump or Drain Level Sensor Fault (Indoor Unit) | View Details |
| CH05 |
Indoor unit displays CH05 and does not respond, or outdoor unit does not start.
|
Communication Error Between Indoor and Outdoor Units | View Details |
| CH06 |
Indoor unit shows CH06 and may stop cooling or heating.
|
Outdoor Air Thermistor Fault | View Details |
| CH09 |
Indoor unit displays CH09 and may not cool or heat properly.
|
Indoor Fan Motor or Fan Feedback Fault | View Details |
| CH10 |
Indoor unit shows CH10 and may not operate or may shut down shortly after starting.
|
Indoor Fan Motor Lock or Overload | View Details |
| CH21 |
Outdoor unit or indoor display shows CH21 and the system will not run or stops quickly.
|
DC Peak (Overcurrent) Error in Outdoor Inverter Circuit | View Details |
| CH22 |
System displays CH22 and will not start or stops during operation.
|
DC Link Overvoltage Error | View Details |
| CH23 |
System shows CH23 and does not operate or shuts down.
|
DC Link Undervoltage Error | View Details |
| CH24 |
System displays CH24 and stops operating, often during heavy load or high ambient temperature.
|
High-Pressure Protection (Refrigerant System Overpressure) | View Details |
| CH25 |
System shows CH25 and stops cooling or heating.
|
Low-Pressure Protection (Refrigerant System Underpressure) | View Details |
| CH26 |
System displays CH26 and shuts down, often shortly after startup.
|
Discharge Pipe High Temperature Protection | View Details |
| CH27 |
System shows CH27 and will not operate normally.
|
Inverter Module Overheating (IPM Overheat Protection) | View Details |
| CH28 |
System displays CH28 and stops operating.
|
Current Sensor Error (Outdoor Unit) | View Details |
| CH29 |
System shows CH29 and will not run or cycles off quickly.
|
DC Compressor Position or Speed Error | View Details |
| CH32 |
System displays CH32 and may not start or may shut down during operation.
|
Outdoor Unit Capacity or Model Mismatch / EEPROM Error | View Details |
| CH33 |
System shows CH33 and stops operation.
|
Refrigerant Cycle Abnormality (Protection Control) | View Details |
| CH34 |
System displays CH34 and shuts down, often during extreme temperatures or heavy load.
|
Safety Shutdown / Abnormal Operation Protection | View Details |
| CH38 |
System shows CH38 and will not cool or heat properly.
|
Refrigerant Charge / Cycle Error (Inverter Protection) | View Details |
| CH41 |
Indoor unit displays CH41 and may not operate correctly.
|
Indoor EEPROM or Configuration Error | View Details |
| CH44 |
System shows CH44 and may not respond to remote commands.
|
Indoor-Outdoor Option or Capacity Mismatch | View Details |
| CH45 |
System displays CH45 and operation is restricted or stopped.
|
Communication Error with Optional Accessories (e.g., Central Controller, Wi-Fi Module) | View Details |
| CH46 |
System shows CH46 and may not operate normally.
|
Refrigerant Distribution or Multi-Split Port Error | View Details |
| CH60 |
Indoor unit displays CH60 and heating performance is poor or stopped (heat pump models).
|
Defrost Sensor or Defrost Cycle Error | View Details |
| – |
Burning, electrical, or chemical smell from indoor or outdoor unit.
|
Electrical Overheating or Component Failure | View Details |
| – |
Indoor unit blows air but there is no cooling (room temperature does not drop).
|
Loss of Cooling Capacity | View Details |
| – |
Indoor unit does not power on at all (no lights, no response to remote).
|
No Power to Indoor Unit | View Details |
| – |
Indoor unit emits a musty or moldy odor when operating.
|
Biological Growth on Indoor Coil or Drain Pan | View Details |
| – |
Indoor unit frequently turns on and off (short cycling) without reaching set temperature.
|
Short Cycling / Improper Capacity Control | View Details |
| – |
Indoor unit makes loud rattling, buzzing, or grinding noises during operation.
|
Indoor Mechanical Noise / Fan or Panel Vibration | View Details |
| – |
Indoor unit powers on but compressor and outdoor fan do not start (only fan runs inside).
|
Outdoor Unit Not Starting | View Details |
| – |
Indoor unit runs but airflow is very weak even at high fan speed.
|
Reduced Indoor Airflow | View Details |
| – |
Outdoor unit fan runs but compressor does not start; no cooling.
|
Compressor Start Failure | View Details |
| – |
Outdoor unit is very noisy (grinding, squealing, or loud vibration).
|
Outdoor Mechanical Noise / Fan or Compressor Vibration | View Details |
| – |
Remote control does not operate the indoor unit (no response, but unit can be controlled from panel if available).
|
Remote Control or IR Receiver Failure | View Details |
| – |
Unit displays correct temperature but actual room temperature is much higher or lower.
|
Temperature Sensing / Calibration Error | View Details |
| – |
Unit trips the circuit breaker when starting or shortly after.
|
Overcurrent / Electrical Short | View Details |
| – |
Water dripping from the indoor unit front panel or onto the wall/floor.
|
Indoor Unit Water Leak (Condensate Drain Problem) | View Details |
| – |
Water pooling around the outdoor unit or dripping excessively from connections.
|
Outdoor Unit Water Leak / Condensate or Defrost Drainage Issue | View Details |
No matching codes found
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