LG AC Error Code List, A Step-by-Step Guide to Fix It
The possibility of errors in LG Acs is not undeniable, and so we have here the LG AC Error Code List, which describes the possible errors to the users and to get the complete list of LG Air Conditioners Error Codes.
by Janani Durga Perumal | Updated Mar 18, 2023
LG ACs
LG ACs are one of the best ACs available on the market. The biggest advantage of LG air conditioners is their high energy savings, along with their higher speed and better cooling range when compared to conventional compressors. R32 refrigerant used in this AC has a lower global warming potential. The low refrigerant detection in the AC, in case of gas leakage or any other issue, will make the refrigerant level go below 40%, thus warning the user about it and shutting down the AC. Whenever someone thinks about an AC for their budget, it’s better to buy an LG AC. In the LG Air Conditioners, the throw distance of air is among the highest in the industry. LG provides a Gold Fin anti-corrosive condenser, which is resistant to corrosion and lengthens the life of the heat exchanger.
LG AC Error Code List
The following is the list of errors that could occur in the LG Air Conditioners.
Indoor Unit Faults
|
Error Code |
Description |
|---|---|
| 1 | Indoor unit room temperature sensor error |
| 2 | Indoor unit inlet pipe sensor error |
| 4 | Float switch error (optional) |
| 5 | Communication error between indoor unit and outdoor units |
| 6 | Indoor unit outlet pipe sensor error |
| 9 | Indoor unit EPROM error |
| 10 | Indoor unit BLDC motor fan lock |
| 12 | Indoor unit middle pipe sensor error |
Outdoor Unit Faults
|
Error Code |
Causes |
|---|---|
| 21 | DC Peak (IPM Fault); Compressor DC voltage was too high |
| 22 | Current Transformed (CT2) error; Alternating current (AC) input too high |
| 23 | DC Link Low Volt |
| 25 | AC Low/High Volt |
| 26 | DC Comp Position Error (not providing rotation), Locking |
| 27 | PSC Fault; Current to inverter compressor between AC and DC converter circuit too high |
| 28 | Inverter compressor DC voltage is too high |
| 29 | Inverter compressor amperage is too high |
| 31 | Current-to-current transformer (CT) thermistor is too low |
| 32 | Inverter Compressor Discharge Pipe (D-Pipe) Overheat |
| 40 | CT Sensor Error; Thermistor is disconnected or shorted out |
| 41 | D-Pipe Sensor INV is disconnected or shorted out |
| 44 | Outdoor Air Sensor is disconnected or shorted out |
| 45 | Middle thermistor of outdoor unit condenser coil is disconnected or shorted out |
| 46 | Outdoor unit suction line thermistor is disconnected or shorted out |
| 48 | Outdoor unit coil outlet (liquid line) thermistor is disconnected or shorted out |
| 53 | Communication failure from outdoor unit to indoor unit |
| 60 | Outdoor unit printed circuit board (PCB) EPROM check sum error |
| 61 | Outdoor unit condenser coil temperature is too high |
| 62 | Outdoor unit inverter compressor PCB heat sink temperature is too high |
| 63 | Condenser coil pipe thermistor temperature is too low |
| 65 | Heat sink thermistor has disconnected or has shorted out |
| 67 | Outdoor brushless direct current (BLDC) fan motor lock error |
Error Codes with Possible Causes
| Error Code | Description | Causes | Check point and normal condition |
|---|---|---|---|
| 1 | Indoor air sensor | • Open / Short • Soldered poorly • Internal circuit error |
Normal resistor: 10KS2/ at 25°C (Unplugged) Normal voltage : 2.5Vdc / at 25°C (plugged) |
| 2 | Indoor inlet pipe sensor | • Open / Short • Soldered poorly |
Normal resistor: 5K£2/ at 25°C (Unplugged) Normal voltage : 2.5Vdc / at 25°C (plugged) |
| 6 | Indoor outlet pipe sensor | • Internal circuit error | - |
| 3 | Communication | • Open / Short | • Connection of wire |
| 3 | Wired R/C | • Wrong connection | • Main PCB Volt. DC 12V • Noise interference |
| 4 | Drain pump/Float switch | • Float switch Open. (Normal: short) | • The connection of wire(Drain pump/ Float switch) • Drain pump power input. (220V) • Drain tube installation. • Indoor unit installation. (Inclination) |
| апр.53 | Communication (Indoor - Outdoor) | • Communication poorly | • Power input AC 220V. (Outdoor, Indoor) • The connector for transmission is disconnected. • The connecting wires are misconnected. • The GND1,2 is not connected at main GND. • The communication line is shorted at GND. • Transmission circuit of outdoor PCB is abnormal. • Transmission circuit of indoor PCB is abnormal. |
| 21 | DC Peak | • Instant over current • Over Rated current • Poor insulation of IPM |
• An instant over current in the U,V,W phase - Comp lock - The abnormal connection of U,V,W • Over load condition - Overcharging of refrigerant - Pipe length. • Poor insulation of compressor |
| 22 | Max. C/T | Over current (14A) | Malfunction of compressor Blocking of pipe Low voltage input Refrigerant, pipe length, blocked |
| 40 | CfT Internal circuit | Initial current error | Malfunction of current detection circuit. (Open / Short) The voltage of “C01N" Is 4.0Vdc(25A). |
| 23 | DC Link | • DC link volt, is 140Vdc. | • Check the power source. |
| 23 | Low voltage. | - | • Check the components. |
| 28 | DC Link High voltage | • DC link volt, is 420Vdc T | - |
| 24 | Press S/W Open | • Low / High press | • Check the connection of “CN_Press”. • Check the components. |
| 25 | Input voltage | • Abnormal Input voltage | • Check the power source. • Check the components. |
| 26 | DC Compressor Position | • Compressor position detect error | • Check the connection of comp wire “U,V,W” • Malfunction of compressor • Check the component of “IPM", detection parts. |
| 27 | PSC Fault | • Over current at "IGBT" | • Check the component of “IGBT". • Check the components. |
| 32 | D-pipe (Inverter) temp, high (105°C t) | • Discharge sensor (Inverter) temp, high | • Check the discharge pipe sensor for INV. • Check the install condition for over load. • Check the leakage of refrigerant. • Check the SVC V/V open. |
| 33 | D-pipe (Constant) temp, high (105°C I) | • Discharge sensor (Cons.) temp, high | • Check the discharge pipe sensor for Cons. • Check the install condition for over load. • Check the leakage of refrigerant. • Check the SVC V/V open. |
| 41 | D-pipe sensor (Inverter) | • Open / Short • Soldered poorly • Internal circuit error |
• Normal resistor: 200K£2 / at 25°C (Unplugged) • Normal voltage : 4.5Vdc / at 25°C (plugged) |
| 44 | Air sensor | - | • Normal resistor: 10K£2 / at 25°C (Unplugged) • Normal voltage : 2.5Vdc / at 25°C (plugged) |
| 45 | Condenser Pipe sensor | - | • Normal resistor: 5K£2 / at 25°C (Unplugged) |
| 46 | Suction Pipe sensor | - | • Normal voltage : 2.5Vdc / at 25°C (plugged) |
| 47 | D-pipe sensor (Constant) | - | • Normal resistor: 200K£2 / at 25°C (Unplugged) • Normal voltage : 4.5Vdc / at 25°C (plugged) |
| 65 | Heat sink sensor | - | • Normal resistor: 10K£2 / at 25°C (Unplugged) • Normal voltage : 2.5Vdc / at 25°C (plugged) |
| 51 | Over capacity | • Over capacity | • Check the indoor unit capacity. • Check the combination table. |
| 60 | EEPROM Check sum | • Check sum error | • Check the PCB ASM P/No. • Check the poor soldering. |
| 61 | Condenser pipe sensor temp, high | • Condenser pipe sensor detected high temp.(65°C) | • Check the load condition. • Check the sensor of Condenser pipe sensor. |
| 62 | Heat sink sensor temp, high | • Heat sink sensor detected high temp.(85°C) | • Check the fan is locked. • Check the sensor of heat sink. |
| май.53 | Title Communication (Indoor - Outdoor) | • Communication poorly | • Power input AC 220V. (Outdoor, Indoor) • The connector for transmission is disconnected. • The connecting wires are misconnected. • The communication line is shorted at GND. • Transmission circuit of outdoor PCB is abnormal. • Transmission circuit of indoor PCB is abnormal. |
| 21 | DC PEAK (IPM Fault) | • Instant over current • Over Rated current • Poor insulation of IPM |
• An instant over current in the U,V,W phase - Comp lock - The abnormal connection of U,V,W • Overload condition - Overcharging of refrigerant Pipe length. Outdoor Fan is stop • Poor insulation of compressor |
LED Error Codes
| Error Code |
Description |
LED 01G/M (Red) | LED 01G/M (Red) | Causes |
|---|---|---|---|---|
| 21 | DC Link Peak (IPM Fault) | 2 times 3 | 1 times 3 | Over Rated Current |
| 22 | CT 2 (Max CT) | 2 times 3 | Input Over Current | |
| 23 | DC Link Low Volt. DC Link High Volt. |
3 times 3 | DC Link Volt is below 140Vdc DC Link Volt is above 420Vdc |
|
| 25 | Low Voltage/Over Voltage | 5 times 3 | Abnormal AC Volt Input | |
| 26 | DC Compressor Position Error | 6 times 3 | Compressor Starting Fall Error | |
| 27 | PSC/PFC Fault Error | 7 times 3 | Over Inverter PCB input current | |
| 29 | COMP Over Current | 9 times 3 | Over Inverter Compressor Current | |
| 32 | D-Pipe High | 3 times 3 | 2 times 3 | D-Pipe Temp. High |
| 35 | Low Pressure Error | 5 times 3 | Excessive decrease of Low Pressure | |
| 39 | Communication Error | 9 times 3 | Communication Error Between PFC Micom and INV Micom | |
| 40 | CT Sensor (Open/Short) | 4 times 3 | 0 | CT Circuit Malfunction |
| 41 | INV. D-Pipe Th Error | 1 times 3 | Open/Short | |
| 43 | High Pressure Sensor Error | 3 times 3 | ||
| 44 | Outdoor Air Th Error | 4 times 3 | ||
| 45 | Cond. Mid-Pipe Th Error | 5 times 3 | ||
| 46 | Suction Pipe Th Error | 6 times 3 | ||
| 48 | Cond. Out-Pipe Th Error | 8 times 3 | ||
| 51 | Capacity Over | 5 times 3 | 1 times 3 | Over combination |
| 53 | Signal Error (Indoor <-> Outdoor) | 3 times 3 | Communication Poorly | |
| 54 | 3-Phase Wrong wiring | 4 times 3 | 3-Phase Wrong Wring of Outdoor Unit (Reverse Phase/Omission of Phase) | |
| 60 | EEPROM Check Sum Error | 6 times 3 | 0 | Check Sum Mismatching |
| 61 | Cond. Pipe Th High | 1 times 3 | Cond. Temp. High | |
| 62 | Heat sink Th High | 2 times 3 | Heatsink Temp. High | |
| 65 | Heat sink Th Error | 5 times 3 | Open/Short | |
| 67 | Outdoor BLDC Fan Lock | 7 times 3 | Outdoor Fan is not operation | |
| 73 | PFC Fault Error(SAN) | 7 times 3 | 3 times 3 | Over Current of Outdoor Unit PFC |
Other Error Codes
|
Error Code |
Causes | Solution |
|---|---|---|
| Code appears in the display. F1,F2 or F3 | Air conditioner is in FAN mode and the number shown is the set fan speed. | This is normal. The air conditioner is working properly. |
| FL | The water collection tank is full. | Empty the water collection tank. |
| CH01 | Short or open circuit in the indoor air thermistor. | Unplug the air conditioner and contact your authorized LG service center. |
|
Error Code |
Function Name |
Description |
|---|---|---|
| 01 h | Read Coil Status | Run/Stop(status), Lock(status), Swing(status), Alarm, Filter Sign(status), Mode Lock(status), Wind Flow Lock(status) |
| 03h | Read Holding Registers | Operation Mode(status), Fan Speed(status), Room Temperature, Error Code, Set Room Temperature(status), Set Lower Temperature(status), Set Upper Temperature(status), User Mode(status) |
| 05h | Force Single Coil | Run/Stop(setting), Lock(setting), Swing(setting), Filter Sign Reset, Mode Lock(setting), Wind Flow Lock(setting) |
| 06h | Preset Single Registers | Operation Mode(setting), Fan Speed(setting), Set Room Temperature(setting), Set Lower Temperature(setting), Set Upper Temperature(setting), User Mode(setting) |
LG Split AC Error Code List
| Error Code | Description |
| LG AC error code po | System in power mode ( not a fault ) |
| LG AC error code lo | System in test mode ( not a fault ) |
| LG AC error code ch 01 | Indoor unit return air thermistor |
| LG AC error code ch 02 | Indoor unit coil inlet thermistor |
| LG AC error code ch 03 | Wiring error between the remote controller and the fan coil |
| LG AC error code ch 04 | Float switch fan |
| LG AC error code ch 05 | Communication indoor and outdoor |
| LG AC error code ch 06 | Indoor unit coil outlet thermistor |
| LG AC error code ch 09 | EEPROM connects on main PCB |
| LG AC error code ch 10 | Indoor fan motor problem |
| LG AC error code ch 21 | Over current in the inverters DC power circuit |
| LG AC error code ch 22 | Compressor over-current |
| LG AC error code ch 25 | Incoming power supply to the system |
| LG AC error code ch 26 | Inverter compressor |
| LG AC error code ch 27 | Inverter module |
| LG AC error code ch 28 | DC voltage inverter is too high |
| LG AC error code ch 29 | Overload operation or compressor damage |
| LG AC error code ch 32 | Inverter compressor discharge temperature is above 105 degrees |
| LG AC error code ch 39 | PCB defect or wiring defect |
| LG AC error code ch 41 | Inverter compressor discharge thermistor fault |
| LG AC error code ch 44 | Outdoor unite air themermistor |
| LG AC error code ch 45 | Condenser coil outlet thermistor |
| LG AC error code ch 46 | Compressor suction thermistor |
| LG AC error code ch 47 | Inverter compressor discharge thermistor fault |
| LG AC error code ch 61 | Outdoor unit condenser coil temperature above 65 degrees |
| LG AC error code ch 62 | Outdoor unit inverter heat-sink thermistor |
| LG AC error code ch 65 | Inverter PCB heat sink thermistor |
| LG AC error code ch 67 | Outdoor fan motor |
| LG AC error code ch 73 | Overload operation or compressor damage |
LG Inverter Air Conditioner Error Codes
| Error Code | Description |
| LG AC error code c1 or ch1 | Indoor temperature sensor open or closed circuit |
| LG AC error code c2 or ch2 | Outdoor temperature sensor open or closed circuit |
| LG AC error code c4 or ch4 | Heat sink temperature sensor open or closed circuit |
| LG AC error code c5 or ch5 | Communication indoor and outdoor units |
| LG AC error code c6 or ch6 | Excessive current at inverter DC power circuit |
| LG AC error code c7 or ch7 | Excessive compressor current |
| LG AC error code c8 or ch8 | Indoor fan not rotating |
| LG AC error code c9 or ch9 | Outdoor fan not rotating |
| LG AC error code ca or ch10 | Faulty discharge thermistor |
| LG AC error code cc | EEPROM error |
| LG AC error code cd | Inverter module error |
| LG AC error code po | System in power mode ( not a fault ) |
| LG AC error code lo | System in test mode ( not a fault ) |
| LG AC error code ch 01 | Indoor unit return air thermistor |
| LG AC error code ch 02 | Indoor unit coil inlet thermistor |
| LG AC error code ch 03 | Wiring error between the remote controller and the fan coil |
| LG AC error code ch 04 | Float switch fan |
| LG AC error code ch 05 | Communication indoor and outdoor |
| LG AC error code ch 06 | Indoor unit coil outlet thermistor |
| LG AC error code ch 09 | EEPROM connects on main PCB |
| LG AC error code ch 10 | Indoor fan motor problem |
| LG AC error code ch 21 | Over current in the inverters DC power circuit |
| LG AC error code ch 22 | Compressor over-current |
| LG AC error code ch 25 | Incoming power supply to the system |
| LG AC error code ch 26 | Inverter compressor |
| LG AC error code ch 27 | Inverter module |
| LG AC error code ch 28 | DC voltage inverter is too high |
| LG AC error code ch 29 | Overload operation or compressor damage |
| LG AC error code ch 32 | Inverter compressor discharge temperature is above 105 degrees |
| LG AC error code ch 39 | PCB defect or wiring defect |
| LG AC error code ch 41 | Inverter compressor discharge thermistor fault |
| LG AC error code ch 44 | Outdoor unite air themermistor |
| LG AC error code ch 45 | Condenser coil outlet thermistor |
| LG AC error code ch 46 | Compressor suction thermistor |
| LG AC error code ch 47 | Inverter compressor discharge thermistor fault |
| LG AC error code ch 61 | Outdoor unit condenser coil temperature above 65 degrees |
| LG AC error code ch 62 | Outdoor unit inverter heat-sink thermistor |
| LG AC error code ch 65 | Inverter PCB heat sink thermistor |
| LG AC error code ch 67 | Outdoor fan motor |
| LG AC error code ch 73 | Overload operation or compressor damage |
How to Fix The LG AC Error Code?
You could refer to the official website of LG for further assistance in fixing the errors in your LG air conditioners. When you purchased your LG air conditioner, they might have given you the user guide. Along with that, you might be notified of the LG technician numbers, and you could call those numbers to get help fixing the error codes on your LG air conditioners.
Disclaimer: The above information is for general informational purposes only. All information on the Site is provided in good faith, however we make no representation or warranty of any kind, express or implied, regarding the accuracy, adequacy, validity, reliability, availability or completeness of any information on the Site.
LG AC Error Code List - FAQs
1. What is LG?
LG Corporation, known as LG and formerly Lucky-Goldstar from 1983 to 1995 is a South Korean multinational conglomerate.
2. Who founded LG?
LG was founded by Koo In-hwoi and managed by successive generations of his family.
3. Where is LG headquartered?
LG is headquartered in Seoul, South Korea.
4. When was LG founded?
LG was founded on 5 January 1947.
5. Mention an advantage of LG ACs.
The biggest advantage of LG air conditioners is their high energy savings.
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