LG Air Conditioner Error Codes

LG’s strong reputation for durability, innovative features,meeting both residential and commercial cooling needs effectively. But it doesn’t mean that your LG’s aircon might not run into problems sometimes. 

But worry not, because in this complete LG error code guide, we’ll show you the different codes and possible causes affecting LG aircon units — and how you can use them to check and troubleshoot the common issues with your LG air conditioner.

LG Air Conditioner Error Codes: The Complete List

Indoor Unit Faults

Error Code	Possible Cause	LED1 (Heating LED)	LED2 (Cooling LED)
1	Indoor unit room temperature sensor error	1 blink	0 blinks
2	Indoor unit inlet pipe sensor error	2 blinks	0 blinks
4	Drain pump / Float switch error (optional)	4 blinks	0 blinks
5	Communication error between indoor unit and outdoor units	5 blinks	0 blinks
6	Indoor unit outlet pipe sensor error	6 blinks	0 blinks
9	Indoor unit EPROM error	9 blinks	0 blinks
10	Indoor unit BLDC motor fan lock	0 blinks	1 blink
12	Indoor unit middle pipe sensor error	2 blinks	1 blink
21	DC Peak (IPM Fault); Compressor DC voltage was too high	2 blinks	1 blink
22	Current Transformed (CT2) error; Alternating current (AC) input too high	2 blinks	2 blinks
23	DC Link Low Voltage	2 blinks	3 blinks
25	AC Low/High Voltage	2 blinks	5 blinks
26	DC Comp Position Error (not providing rotation), Locking	2 blinks	6 blinks
27	PSC Fault; Current to inverter compressor between AC and DC converter circuit too high	2 blinks	7 blinks
28	Inverter compressor DC voltage is too high	2 blinks	8 blinks
29	Inverter compressor amperage is too high	2 blinks	9 blinks
31	Current-to-current transformer (CT) thermistor is too low	3 blinks	1 blink
32	Inverter Compressor Discharge Pipe (D-Pipe) Overheat	3 blinks	2 blinks
40	CT Sensor Error; Thermistor is disconnected or shorted out	4 blinks	0 blinks
41	D-Pipe Sensor INV is disconnected or shorted out	4 blinks	1 blink
44	Outdoor Air Sensor is disconnected or shorted out	4 blinks	4 blinks
45	Middle thermistor of outdoor unit condenser coil is disconnected or shorted out	4 blinks	5 blinks
46	Outdoor unit suction line thermistor is disconnected or shorted out	4 blinks	6 blinks
48	Outdoor unit coil outlet (liquid line) thermistor is disconnected or shorted out	4 blinks	8 blinks
53	Communication failure from outdoor unit to indoor unit	5 blinks	3 blinks
60	Outdoor unit printed circuit board (PCB) EEPROM check sum error	6 blinks	0 blinks
61	Outdoor unit condenser coil temperature is too high	6 blinks	1 blink
62	Outdoor unit inverter compressor PCB heat sink temperature is too high	6 blinks	2 blinks
63	Condenser coil pipe thermistor temperature is too low	6 blinks	3 blinks
65	Heat sink thermistor has disconnected or has shorted out	6 blinks	5 blinks
67	Outdoor brushless direct current (BLDC) fan motor lock error	6 blinks	7 blink

‍

Outdoor Unit Faults

Error Code	Possible Cause	LED1 (Green)	LED2 (Red)
21	DC Peak (IPM Fault); Compressor DC voltage was too high	2 blinks	1 blink
22	Current Transformed (CT2) error; Alternating current (AC) input too high	2 blinks	2 blinks
23	DC Link Low Voltage	2 blinks	3 blinks
24	Low / High Pressure	2 blinks	5 blinks
25	AC Low/High Voltage	2 blinks	5 blinks
26	DC Comp Position Error (not providing rotation), Locking	2 blinks	6 blinks
27	PSC Fault; Current to inverter compressor between AC and DC converter circuit too high	2 blinks	7 blinks
28	Inverter compressor DC voltage is too high	2 blinks	8 blinks
29	Inverter compressor amperage is too high	2 blinks	9 blinks
31	Current-to-current transformer (CT) thermistor is too low	3 blinks	1 blink
32	Inverter Compressor Discharge Pipe (D-Pipe) Overheat	3 blinks	2 blinks
33	Discharge pipe (cons.) overheat	3 blinks	3 blinks
34	High-pressure sensor high	3 blinks	4 blinks
35	Low-pressure sensor low	3 blinks	5 blinks
36	Refrigerant leak detection	3 blinks	6 blinks
37	Compression ratio limit exceeded	3 blinks	7 blinks
38	Refrigerant leak detection	3 blinks	8 blinks
39	Communication error	3 blinks	9 blinks
40	CT Sensor Error; Thermistor is disconnected or shorted out	4 blinks	0 blinks
41	D-Pipe Sensor INV is disconnected or shorted out	4 blinks	1 blink
44	Outdoor Air Sensor is disconnected or shorted out	4 blinks	4 blinks
45	Middle thermistor of outdoor unit condenser coil is disconnected or shorted out	4 blinks	5 blinks
46	Outdoor unit suction line thermistor is disconnected or shorted out	4 blinks	6 blinks
48	Outdoor unit coil outlet (liquid line) thermistor is disconnected or shorted out	4 blinks	8 blinks
53	Communication failure from outdoor unit to indoor unit	5 blinks	3 blinks
60	Outdoor unit printed circuit board (PCB) EEPROM check sum error	6 blinks	0 blinks
61	Outdoor unit condenser coil temperature is too high	6 blinks	1 blink
62	Outdoor unit inverter compressor PCB heat sink temperature is too high	6 blinks	2 blinks
63	Condenser coil pipe thermistor temperature is too low	6 blinks	3 blinks
65	Heat sink thermistor has disconnected or has shorted out	6 blinks	5 blinks
67	Outdoor brushless direct current (BLDC) fan motor lock error	6 blinks	7 blink

‍

Other Error Codes

Error Code	Possible Cause	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.

Still facing some issues with your LG air conditioner? Don’t forget to check your warranty before scheduling any repairs! If your LG air conditioner is still covered, you might be eligible for free repairs or parts replacement.  For any issues with your LC aircon, you should follow the steps here to request a repair.  

For more information about LG air conditioning error codes, feel free to consult the following links for additional reference:

• https://www.lg.com/us/support/help-library/lg-air-conditioner-room-ac-error-code-list–1432829295501
• https://lghvac.com/resource-service?filename=DFS-TP-AH-001-US_012H10_LGTechPaper_ErrorCodes_LS_091-121_HSV.pdf