LG Inverter AC error code part-1

September 20, 2021October 2, 2021 Sayeeda Bano 0 Comments LG, lg ac, Universal Split Fault Codes Sheet

If there is a fault on any LG Universal unit, a two-digit number will appear on the remote controllers led
display. If the unit does not have a remote controller the fault will be displayed using the LED’s on the front of
the indoor unit. (Lg ac)

The “Units” digit of the fault code is shown by the power led which has the following symbol by it
This is usually Red, but on a few models it is Green.

The “Tens” digit will be displayed by one other led, usually the “Sleep” or “Filter” lamp.

Error Indicator in lg ac:

The function provides self-diagnosis and displays an error code if there is any trouble.
Error codes are displayed on the Indoor unit’s Wired Remote as CH**, and/or Fascia Display. In addition, the code is indicated via LED’s on the outdoor unit control board.
If more than two troubles occur simultaneously, the lower number of error code is displayed first.
After an error occurs, if error is released, error LED is also released simultaneously.

Indoor Unit Faults lg ac:

Error code	Contents	Case of error	Indoor Status
01	Air sensor (open/short)	Open / Short circuit	Off
02	Inlet pipe sensor	Open / Short circuit	Off
03	Communication(Indoor ↔ Wired R/Control)	Communication Poorly	Off
04	Drain pump / Float switch	Float switch Open circuit (High level water alarm)	Off
05	Communication(Indoor ↔ Outdoor)	Communication Poorly	Off
06	Outlet pipe sensor	Open / Short circuit	Off
07	Different operation mode	Indoor units set in different operation modes	Off
09	Checksum Error	Defective PCB or EEPROM Connections	Off
10	BLDC Motor Fan Lock (Indoor)	Fan Motor or PCB Defective	Off
HL	Hard Lock (Controlled by External Source)	Controlled by Dry Contact or Central Controller	Off
CL	Child Lock Function selected	Not an error, press Timer & Min buttons simultaneously for 3 seconds to toggle On/Off	On
Po	Jet Cool Mode selected	Not an error, press Jet Cool button to toggle On/Off	On

Outdoor Unit Faults can also be read from the outdoor unit PCB using the flashing LED’s as below for lg ac:


21	IPM Fault (Compressor Over current)	2 times	1 time	Compressor malfunction, IPM Fault	Off
22	CT 2 (Max. Current)	2 times	2 times	Current is 14A ↑	Off
23	DC Link Low Volt.	2 times	3 times	DC Link volt. Is 140V ↓	Off
24	Low / High Pressure	2 times	4 times	Low / High press switch OPENLow / High press switch OPEN	Off
25	AC Low / AC High Volts.	2 times	5 times	Abnormal AC volt. Input.	Off
26	DC Compressor Position	2 times	6 times		Off
27	PSC Fault (Reactor)	2 times	7 times		Off
28	DC Link High Volts	2 times	8 times	Off	Off
29	COMP Over Current	2 times	9 times	Inverter Compressor input current is over 30A	Off
32	Discharge Pipe Temp. High (INV)	3 times	2 times	D-Pipe Temp (Inv.) >105°C	Off
33	Discharge Pipe Temp. High (Cons.)	3 times	3 times	D-Pipe Temp (Const) >105°C	Off
39	Communication Error	3 times	9 times	Communication Error Between PFC and INV PCB’s	Off
40	CT Circuit	4 times		CT Circuit malfunction	Off
41	D-Pipe sensor INV. (Open/Short)	4 times	1 time	Open / Short circuit.	Off
44	Air sensor (Open/Short)	4 times	4 times	Open / Short circuit	Off
45	Cond. Pipe Sensor (Open/Short)	4 times	5 times	Open / Short circuit	Off
46	Suction Pipe Sensor (Open/Short)	4 times	6 times	Open / Short circuit	Off
47	D-pipe Sensor Cons. (Open/Short)	4 times	7 times	Open / Short circuit	Off
48	D-Pipe & Air Sensor (Open)	4 times	8 times	Dual Sensor unplugged	Off
51	Over Capacity	5 times	1 times	Over Load Combination	Off
52	Communication Error (Main micom ↔ Sub micom)	5 times	2 times	Over Load Combination	Off
53	Communication Error (Indoor ↔ Outdoor)	5 times	3 times	Poor/Loss of Communication	Off
54	Outdoor 3-Phase Power Supply Reverse Phase / Missing Phase	5 times	4 times	Incorrect Wiring	Off
60	EEPROM Check Sum	6 times		Check Sum Mis-Match	Off
61	Cond. Pipe Sensor Temp. High	6 times	1 time	Cond. Temp. High	Off
62	Heat Sink Sensor Temp. High	6 times	2 time	Heat Sink Temp. High	Off
63	Cond. Pipe Sensor Temp. LowCond. Pipe Sensor Temp. LowCond. Pipe Sensor Temp. Low	6 times	3 time	Cond. Temp. Low	Off
65	Heat Sink Sensor (Open/Short)	6 times	5 Times	Open / Short circuit	Off
67	Outdoor BLDC Fan Lock	6 times	7 times	Fan Motor/Circuit Problem	Off
73	PFC Fault Error (S/W)	7 times	3 times	Inverter PCB input current is over 48A (Peak) for 2ms
105	Comms. Error (Main board ↔Fan board)	6 times	5 times	Poor/Loss of Communication	Off

Heavy Discount on iPhone 13

LG Ac – Universal Split Fault Codes Sheet

Fault code 01

Is a fault with the Indoor unit return air Thermistor
Unplug the Thermistor from the PCB and Check its resistance check against this graph:

Alternatively the sensor can be tested while still connected to the PCB measure the DC voltage across the
resistor and check it against the graph below.

Fault code 02

Is a problem with the Indoor unit coil inlet Thermistor
Unplug the Thermistor from the indoor PCB and Check its resistance against this graph:

Alternatively the sensor can be tested while still connected to the PCB measure the DC voltage across the
resistor and check it against the graph below.

Fault Code 03

This indicates a wiring error between the remote controller and the fan coil, this is most common in group control
applications where more than 1 fan coil is connected to a single remote controller.
Firstly check the wiring has been done correctly see below.

Next check the switch in the back of the remote controller, it has to be set to Group or GR1 for group control,
the Factory setting is Single or SG, after setting the switch reset the power for 2 minutes. If the fault does not
clear, check the Voltage of the remote controller cable.

The Red cable is 12 Vdc
The Brown or Black cable is Ground or 0 Vdc
The Yellow is signal (Comms.)
Test
Voltage across the Brown/ Black cable and the Red, this
should be 12 Vdc
Voltage from Yellow to Brown/Black this should be
fluctuating between 8 – 12 Vdc.

Fault Code 04

Fault code CH04 indicates that the float switch of the fan coil has risen.
On fan coils without a drain pump it indicates that the jumper (blue plug with 30mm of blue wire) in terminal
CN FLOAT is missing.
If the fan coil is running and the float rises it will take 3 ½ minutes for the fault to show on the controller, this is
to give the unit time to pump excess water away. Once the float falls, (or the jumper is put back into the board)
it will not be possible to clear the fault for 40 seconds. It is considered good practice to reset the power to
clear this fault code in lg ac.