LG AC Error Code List, A Step-by-Step Guide to Fix It

Q: 4. When was LG founded?

LG was founded on5 January 1947.

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 C Hariharan | Updated Apr 21, 2023

Fresherslive

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
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
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
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
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
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
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.

Next Article ››

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.

LG AC Error Code List, A Step-by-Step Guide to Fix It

LG ACs

LG AC Error Code List

Indoor Unit Faults

Outdoor Unit Faults

Error Codes with Possible Causes

LED Error Codes

Other Error Codes

LG Split AC Error Code List

LG Inverter Air Conditioner Error Codes

How to Fix The LG AC Error Code?

LG AC Error Code List - FAQs

About Us

Contact Us

Privacy Policy

Terms of Use

User Agreement

Disclaimer

DMCA