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.

 A09AW   A12AW  A09AW1  A12AW1   LG ART COOL Panel Inverter error codes

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

C09AW*  C12AW*  ART COOL Deluxe Inverter

1. The malfunction indicator of indoor (see the operating LED of the INDOOR)

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

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

Temp is 85°C below.
5Comunication error (serial

comunication).
The operating LED will be blink-
ing 5 times.
The operation is off(enable to restart

by remote controller).
6DC peak error.The operating LED will be blink-
ing 6 times.
Compressor will be turned off immediately.

(not enable to restart by remote controller)
7Running current is over-
loaded. (CT2)
The operating LED will be blink-
ing 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)
by remote controller). 8

The operating LED will be blink-
ing 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 blink-
ing 9 times.
The operation is off(enable to restart
10D-PIPE TH is short or open.The operating LED will be blink-
ing 10 times.
Compressor will be turned off immediately.

(restart compressor when D-PIPE TH. is

recovred)

2. The malfunction indicator of outdoor (see the LED01M on the outdoor PCB ass’y)

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

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

Temp is 85°C below.
5Comunication error (serial

comunication).
The operating LED will be blink-
ing 5 times.
The operation is off(enable to restart

by remote controller).
6DC peak error.The operating LED will be blink-
ing 6 times.
Compressor will be turned off immediately.

(not enable to restart by remote controller)
7Running current is over-
loaded.
The operating LED will be blink-
ing 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 blink-
ing 9 times.
The operation is off(enable to restart

by remote controller).
10D-PIPE TH is short or open.The operating LED will be blink-
ing 10 times.
Compressor will be turned off immediately.

(restart compressor when D-PIPE TH. is

recovred)

C18AW*  C24AW*  LG ART COOL error codes

1. The malfunction indicator of indoor (see the operating LED of the 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"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 over-
loaded. (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 (see the LED01M on the outdoor PCB ass’y)

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

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

Temp is 85°C below.
5Comunication error (serial

comunication).
The operating LED will be blink-
ing 5 times.
The operation is off(enable to restart

by remote controller).
6DC peak error.The operating LED will be blink-
ing 6 times.
Compressor will be turned off immediately.

(not enable to restart by remote controller)
7Running current is over-
loaded.
The operating LED will be blink-
ing 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 blink-
ing 9 times.
The operation is off(enable to restart

by remote controller).
10D-PIPE TH is short or open.The operating LED will be blink-
ing 10 times.
Compressor will be turned off immediately.

(restart compressor when D-PIPE TH. is

recovred)