lg_split_codes.pdf

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LG Air Conditioning Universal & Multi Split Fault Codes Sheet
Universal and Multi Split Units
If there is a fault on any LG Universal or Multi 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.
2 nd digit
1 st digit
The second digit of the fault code is shown by the power led which has the following symbol by it
The first digit will be displayed by one other led.
Error Indicator:
•
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:
Error
code
Indoor
Status
Contents
Case of error
01
Air sensor (open/short)
Open / Short circuit
Off
02
Inlet pipe sensor
Open / Short circuit
Off
Communication(Indoor ř Wired
R/Control)
03
Communication Poorly
Off
Float switch Open circuit (High level water
alarm)
04
Drain pump / Float switch
Off
05
Communication(Indoor ř Outdoor)
Communication Poorly
Off
06
Outlet pipe sensor
Open / Short circuit
Off
07
Different operation mode
Indoor units set in different operation modes
Off
HL
High Limit (Float Switch)
Same as code 04, Float switch Open circuit
Off
Not an error, press Timer & Min buttons
simultaneously for 3 seconds to toggle On/Off
CL
Child Lock Function selected
On
Not an error, press Jet Cool button to toggle
On/Off
Po
Jet Cool Mode selected
On
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LG Air Conditioning Universal & Multi Split Fault Codes Sheet
Outdoor Unit Faults can also be read from the outdoor unit PCB using the flashing LED’s as below:
Error
code
LED01G
(Red)
LED02G
(Green)
Outdoor
Status
Contents
Case of Error
IPM Fault (Compressor Over
current)
Compressor malfunction, IPM
Fault
21
2 times
1 time
Off
22
CT 2 (Max. Current)
2 times
2 times
Current is 14A Ŗ
Off
DC Link volt. Is 140V Ř
23
DC Link Low Volt.
2 times
3 times
Off
Low / High press switch
OPEN
24
Low / High Pressure
2 times
4 times
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
32
Discharge Pipe Temp. High (INV)
3 times
2 times
Off
Off
Discharge Pipe Temp. High
(Cons.)
33
3 times
3 times
Off
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
Suction Pipe Sensor
(Open/Short)
46
4 times
6 times
Open / Short circuit
Off
D-pipe Sensor Cons.
(Open/Short)
47
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
Communication Error (Main
micom ř Sub micom)
52
5 times
2 times
Poor/Loss of Communication
Off
Communication Error (Indoor ř
Outdoor)
53
5 times
3 times
Poor/Loss of Communication
Off
Outdoor 3-Phase Power Supply
Reverse Phase / Missing Phase
54
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 times
Heat Sink Temp. High
Off
63
Cond. Pipe Sensor Temp. Low
6 times
3 times
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
Comms. Error (Main board řFan
board)
105
6 times
5 times
Poor/Loss of Communication
Off
The codes are explained in detail on the following pages.
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LG Air Conditioning Universal & Multi 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:
Resistance of Air thermistor
20
18
16
14
12
10
8
6
10
15
20
25
30
35
40
Temperature
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.
Voltage across Air thermistor
3.5
3.0
2.5
2.0
1.5
10
15
20
25
30
35
40
Temperature
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LG Air Conditioning Universal & Multi Split Fault Codes Sheet
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:
Coil thermistor resistance k Ohms
20
15
10
5
0
0
10
20
30
40
50
60
70
Temperature
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.
Voltage across coil thermistor
4.0
3.0
2.0
1.0
0.0
0
10
20
30
40
50
60
70
Temp
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LG Air Conditioning Universal & Multi Split Fault Codes Sheet
Fault Code 03
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.
2 3
2 3
1 2 3
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.
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