LG ART COOL error codes

LG is a South Korean corporation founded in 1947. Its product range consists mainly of telecommunication systems, electronics, and chemicals. The air conditioning systems manufactured by LG include the Art Cool range of Inverter models characterized with custom design elements and energy-efficient technology.
There can be many signs of a breakdown within your LG Art Cool air conditioner, starting from water puddles and unusual noises. Whatever the reason, it is very important to check the error code, because it is a clue to troubleshooting the appliance. When you find the explanation of the fault codes in the table below, you will be ready to either fix the air conditioning system on your own or book a service engineer.

LG ART COOL Panel Inverter air conditioner error codes

(A09AW, A12AW,  A09AW1,  A12AW1)

Error codeDescriptionCause of error
1Indoor TH. is short or open• Indoor TH. (sensor) is short or open

• Indoor TH. (sensor) is not connected to the indoor pcb assembly

• Damage or defect on the sensing circuit of indoor pcb assembly.

(R01H, R02H, R03H, R04H, C01H, C02H)
2Outdoor TH. is short or open• Outdoor TH. (sensor) is short or open

• Outdoor TH. (sensor) is not connected to the outdoor pcb assembly

• Damage or defect on the sensing circuit of outdoor pcb assembly.

(R03H~R06H, C02H, C03H)
4Heat-sink Temp. is over 95°C

Heat-sink TH.

is open or short
• Heat-sink TH. is damaged (short or open).

• Heat-sink Temp. is over 95°C

• Damage or defect on the sensing circuit of outdoor pcb assembly.

(R01H, R02H, C01H)
5Communication Error• Wrong or missing wiring between indoor and outdoor unit cable

• Defect of communication components in indoor pcb assembly

• Defect of communication components in outdoor pcb assembly

• Defect of power supply components in outdoor pcb assembly

• No ground connection in air conditioner unit

(affected by noise in power source)
6DC Peak Error• Supplied power is not normal

• Comp Connector (CN-U,V,W) is disconnected or inserted to wrong

position

• Compressor is damaged (coil short) ➔ replace compressor

• Too much Refrigerant

• Defect in outdoor pcb assembly ➔ replace pcb assembly
7Over current Error (CT2)• Supplied power is not normal

• Indoor/outdoor fan is locked

• Too much refrigerant

• Defect in current sensing circuit in outdoor pcb assembly
8Indoor fan is locked (BLDC fan model only)• Indoor fan is locked or separated

• Fan connector is not connected to indoor pcb assembly

• Defective in DC-fan driving circuit
9Outdoor fan is locked (BLDC fan model only)• Outdoor fan is locked by an obstacle (ex : branch of tree, bar...etc)

• Fan connector is not connected to outdoor pcb assembly

• Defective in DC-fan driving circuit
10D-Pipe TH. is short or open• D_pipe TH. is short or open

• D_pipe TH. is not connected to the outdoor pcb assembly

• Damage or defect on the sensing circuit of outdoor pcb assembly

LG ART COOL Deluxe Inverter air conditioner error codes (C09AW*  C12AW* )

1. The malfunction indicator of indoor

Error CodeThe cause of malfunctionMalfunction indicatorThe operating state
1Indoor TH. is short or open.The operating LED will be blinking once.Keep operating state.
2Outdoor TH. is short or open.The operating LED will be blinking twice.Keep operating state.
4Temp. of Heat sink is over 95°C.

/Heat sink TH. is short or open.
The operating LED will be blinking 4 times.Restart compressor when Heat sink Temp is 85°C below.
5Comunication error (serial comunication).The operating LED will be blinking 5 times.The operation is off (enable to restart by remote controller).
6DC peak error.The operating LED will be blinking 6 times.Compressor will be turned off immediately.

(not enable to restart by remote controller)
7Running current is overloaded. (CT2)The operating LED will be blinking 7 times.Compressor will be turned off immediately.

(not enable to restart by remote controller)
8Indoor fan lock error by remote controller).
8 (BLDC fan model)
The operating LED will be blinking 8 times.The operation is off (enable to restart)
9Outdoor fan lock error by remote controller).
9 (BLDC fan model)
The operating LED will be blinking 9 times.The operation is off (enable to restart)
10D-PIPE TH is short or open.The operating LED will be blinking 10 times.Compressor will be turned off immediately.

(restart compressor when D-PIPE TH. is recovred)


2. The malfunction indicator of outdoor

Error CodeThe cause of malfunctionMalfunction indicatorThe operating state
2Outdoor TH. is short or open.The operating LED will be blinking twice.Keep operating state.
4Temp. of Heat sink is over 95°C.

/Heat sink TH. is short or open.
The operating LED will be blinking 4 times.Restart compressor when Heat sink

Temp is 85°C below.
5Comunication error (serial comunication).The operating LED will be blinking 5 times.The operation is off (enable to restart by remote controller).
6DC peak error.The operating LED will be blinking 6 times.Compressor will be turned off immediately.
(not enable to restart by remote controller)
7Running current is overloaded. The operating LED will be blinking 7 times.Compressor will be turned off immediately.
(not enable to restart by remote controller)
9Outdoor fan lock error

(BLDC fan model)
The operating LED will be blinking 9 times.The operation is off (enable to restart by remote controller).
10D-PIPE TH is short or open.The operating LED will be blinking 10 times.Compressor will be turned off immediately.

(restart compressor when D-PIPE TH. is recovred)

LG ART COOL air conditioner error codes (C18AW*  C24AW* )

1. The malfunction indicator of indoor

Error CodeThe cause of malfunctionMalfunction indicatorThe operating state
1Indoor TH. is short or open.The display show "C1"Keep operating state.
2Outdoor TH. is short or open.The display show "C2"Keep operating state.
4Temp. of Heat sink is over 95°C.

/Heat sink TH. is short or open.
The display show "C4"Restart compressor when Heat sink Temp is 85°C below.
5Comunication error (serial comunication).The display show "C5" (error solution C5)The operation is off (enable to restart by remote controller).
6DC peak error.The display show "C6"Compressor will be turned off immediately.

(not enable to restart by remote controller)
7Running current is overloaded. (CT2)The display show "C7"Compressor will be turned off immediately.

(not enable to restart by remote controller)
8Indoor fan lock error by remote controller). 8 (BLDC fan model)The display show "C8"The operation is off (enable to restart by remote controller).
9Outdoor fan lock error by remote controller). 9 (BLDC fan model)The display show "C9"The operation is off (enable to restart by remote controller).
10D-PIPE TH is short or open.The display show "C10"Compressor will be turned off immediately.

(restart compressor when D-PIPE TH. is

recovred)


2. The malfunction indicator of outdoor

Error CodeThe cause of malfunctionMalfunction indicatorThe operating state
2Outdoor TH. is short or open.The operating LED will be blinking twice.Keep operating state.
4Temp. of Heat sink is over 95°C.

/Heat sink TH. is short or open.
The operating LED will be blinking 4 times.Restart compressor when Heat sink

Temp is 85°C below.
5Comunication error (serial comunication).The operating LED will be blinking 5 times.The operation is off (enable to restart by remote controller).
6DC peak error.The operating LED will be blinking 6 times.Compressor will be turned off immediately.

(not enable to restart by remote controller)
7Running current is overloaded. The operating LED will be blinking 7 times.Compressor will be turned off immediately.

(not enable to restart by remote controller)
9Outdoor fan lock error

(BLDC fan model)
The operating LED will be blinking 9 times.The operation is off (enable to restart by remote controller).
10D-PIPE TH is short or open.The operating LED will be blinking 10 times.Compressor will be turned off immediately.

(restart compressor when D-PIPE TH. is recovred)

Lg inverter air conditioner error codes

Error CodeDescriptionNo. of Times Indoor Unit LEDs Blink
LED1 (Heating LED)LED2 (Cooling LED)
1Indoor unit return air thermistor has disconnected or has shorted out.1X
2Indoor unit inlet pipe thermistor has disconnected or has shorted out.2X
5Communication failure from indoor unit to outdoor unit.5X
6Indoor unit outlet pipe thermistor has disconnected or has shorted out.6X
9Indoor unit EEPROM error.9X
10Indoor unit fan has locked up (fan motor operation failure).1X
12Indoor unit middle pipe thermistor has disconnected or has shorted out.2X1X
21DC peak error 1IPM fault; compressor DC voltage was too high.2X1X
22Current transformed (CT2) error; AC input current is too high.2X2X
23DC link voltage is too low.2X3X
25Voltage to the system is too low or too high.2X5X
26Inverter compressor has seized up or is not providing rotation.2X6X
27Prospective short circuit (PSC) fault error: current to inverter compressor between AC and DC converter circuit is too high.2X7X
28Inverter compressor DC voltage is too high.2X8X
29Inverter compressor amperage is too high.2X9X
31Current to the current transformer (CT) thermistor is too low.3X1X
32Inverter compressor discharge pipe temperature is too high.3X2X
40Current transformer (CT) thermistor has disconnected or has shorted out.4X
41Inverter compressor discharge pipe thermistor has disconnected or has shorted out.4X1X
44Outdoor unit inlet air thermistor has disconnected or has shorted out.4X4X
45Outdoor unit condenser coil middle thermistor has disconnected or has shorted out.4X5X
46Outdoor unit suction line thermistor has disconnected or has shorted out.4X6X
48Outdoor unit coil outlet (liquid line) thermistor has disconnected or has shorted out.4X8X
53Communication failure from outdoor unit to indoor unit.5X3X
60Outdoor unit PCB EEPROM check sum error.6X
61Outdoor unit condenser coil temperature is too high.6X1X
62Outdoor unit inverter compressor PCB heat sink temperature is too high.6X2X
63Condenser coil pipe thermistor temperature is too low.6X3X
65Heat sink thermistor has disconnected or has shorted out.6X5X
67Outdoor BLDC fan motor lock error.6X7X