LG AC Error Codes and Troubleshooting

1. Split Type,
2. Mutli System,
3. Floor Standing,
4. Cassette Type,
5. PTAC Type,
6. Portable AC,
7. Troubleshooting and Manuals.

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.

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.

LG AC Error Codes and Troubleshooting

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

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.

1.LG Split Type AC Error Codes

Indoor Unit Faults:

Error Codes	Cause
C1 or CH1	Indoor temperature sensor open or closed circuit.
C2 or CH2	Outdoor temperature sensor open or closed circuit.
C4 or CH4	Heat sink temperature sensor open or closed circuit.
C5 or CH5	Communication between indoor and outdoor units.
C6 or CH6	Excessive current at inverter DC power circuit.
C7 or CH7	Excessive compressor current
C8 or CH8	Indoor fan not rotating.
C9 or CH9	Outdoor fan not rotating.
CA	1. Discharge temp more than130 °C 2. Faulty discharge thermistor
CC	EEPROM error
CD	Inverter module error
Po	System in Power Mode – not a fault
Lo	System in test mode – not a fault

2.LG Multi Type AC Error Codes

LG Multi Type AC Error Codes

Error Code = 01
Contents = Air sensor (open/short)
Case Of Error = Open / Short circuit
Indoor Status = Off

Error Code = 02
Contents = Inlet pipe sensor
Case Of Error = Open / Short circuit
Indoor Status = Off

Error Code = 03
Contents = Communication(Indoor Wired R/Control)
Case Of Error = Communication Poorly
Indoor Status = Off

Error Code = 04
Contents = Drain pump / Float switch
Case Of Error = Float switch Open circuit (High level water alarm)
Indoor Status = Off

Error Code = 05
Contents = Communication(Indoor Outdoor)
Case Of Error = Communication Poorly
Indoor Status = Off

Error Code = 06
Contents = Outlet pipe sensor
Case Of Error = Open / Short circuit
Indoor Status = Off

Error Code = 07
Contents = Different operation mode
Case Of Error = Indoor units set in different operation modes
Indoor Status = Off

Error Code = HL
Contents = High Limit (Float Switch)
Case Of Error = Same as code 04, Float switch Open circuit
Indoor Status = Off

Error Code = CL
Contents = Child Lock Function selected
Case Of Error = Not an error, press Timer & Min buttons simultaneously for 3 seconds to toggle On/Off
Indoor Status = On

Error Code = 21
Contents = IPM Fault (Compressor Over current)
LED01G = 2 times (Red)
LED02G = 1 time (Green)
Case Of Error = Compressor malfunction, IPM Fault
Outdoor Status = Off

Error Code = 22
Contents = CT 2 (Max. Current)
LED01G = 2 times (Red)
LED02G = 2 times (Green)
Case Of Error = Current is 14A
Outdoor Status = Off

Error Code = 23
Contents = DC Link Low Volt.
LED01G = 2 times (Red)
LED02G = 3 times (Green)
Case Of Error = DC Link volt. Is 140V
Outdoor Status = Off

Error Code = 24
Contents = Low / High Pressure
LED01G = 2 times (Red)
LED02G = 4 times (Green)
Case Of Error = Low / High press switch OPEN
Outdoor Status = Off

Error Code = 25
Contents = AC Low / AC High Volts.
LED01G = 2 times (Red)
LED02G = 5 times (Green)
Case Of Error = Abnormal AC volt. Input.
Outdoor Status = Off

Error Code = 26
Contents = DC Compressor Position
LED01G = 2 times (Red)
LED02G = 6 times (Green)
Outdoor Status = Off

Error Code = 27
Contents = PSC Fault (Reactor)
LED01G = 2 times (Red)
LED02G = 7 times (Green)
Outdoor Status = Off

Error Code = 28
Contents = DC Link High Volts
LED01G = 2 times (Red)
LED02G = 8 times (Green)
Case Of Error = Off
Outdoor Status = Off

Error Code = 32
Contents = Discharge Pipe Temp. High (INV)
LED01G = 3 times (Red)
LED02G = 2 times (Green)
Case Of Error = Off
Outdoor Status = Off

Error Code = 33
Contents = Discharge Pipe Temp. High (Cons.)
LED01G = 3 times (Red)
LED02G = 3 times (Green)
Case Of Error = Off
Outdoor Status = Off

Error Code = 40
Contents = CT Circuit
LED01G = 4 times (Red)
LED02G = (Green)
Case Of Error = CT Circuit malfunction
Outdoor Status = Off

LG AC Remote Control Operations

Error Code = 41
Contents = D-Pipe sensor INV. (Open/Short)
LED01G = 4 times (Red)
LED02G = 1 time (Green)
Case Of Error = Open / Short circuit.
Outdoor Status = Off

Error Code = 44
Contents = Air sensor (Open/Short)
LED01G = 4 times (Red)
LED02G = 4 times (Green)
Case Of Error = Open / Short circuit.
Outdoor Status = Off

Error Code = 45
Contents = Cond. Pipe Sensor (Open/Short)
LED01G = 4 times (Red)
LED02G = 5 times (Green)
Case Of Error = Open / Short circuit.
Outdoor Status = Off

Error Code = 46
Contents = Suction Pipe Sensor (Open/Short)
LED01G = 4 times (Red)
LED02G = 6 times (Green)
Case Of Error = Open / Short circuit
Outdoor Status = Off

Error Code = 47
Contents = D-pipe Sensor Cons. (Open/Short)
LED01G = 4 times (Red)
LED02G = 7 times (Green)
Case Of Error = Open / Short circuit
Outdoor Status = Off

Error Code = 48
Contents = D-Pipe & Air Sensor (Open)
LED01G = 4 times (Red)
LED02G = 8 times (Green)
Case Of Error = Dual Sensor unplugged
Outdoor Status = Off

Error Code = 51
Contents = Over Capacity
LED01G = 5 times (Red)
LED02G = 1 times (Green)
Case Of Error = Over Load Combination
Outdoor Status = Off

Error Code = 52
Contents = Communication Error (Main micom Sub micom)
LED01G = 5 times (Red)
LED02G = 2 times (Green)
Case Of Error = Poor/Loss of Communication
Outdoor Status = 0ff

Error Code = 53
Contents = Communication Error (Indoor Outdoor)
LED01G = 5 times (Red)
LED02G = 3 times (Green)
Case Of Error = Poor/Loss of Communication
Outdoor Status = Off

Error Code = 54
Contents = Outdoor 3-Phase Power Supply Reverse Phase / Missing Phase
LED01G = 5 times (Red)
LED02G = 4 times (Green)
Case Of Error = Incorrect Wiring
Outdoor Status = Off

Error Code = 60
Contents = EEPROM Check Sum
LED01G = 6 times (Red)
LED02G = (Green)
Case Of Error = Check Sum Mis-Match
Outdoor Status = Off

Error Code = 61
Contents = Cond. Pipe Sensor Temp. High
LED01G = 6 times (Red)
LED02G = 1 time (Green)
Case Of Error = Cond. Temp. High
Outdoor Status = Off

Error Code = 62
Contents = Heat Sink Sensor Temp. High
LED01G = 6 times (Red)
LED02G = 2 times (Green)
Case Of Error = Heat Sink Temp. High
Outdoor Status = Off

Error Code = 63
Contents = Cond. Pipe Sensor Temp. Low
LED01G = 6 times (Red)
LED02G = 2 times (Green)
Case Of Error = Cond. Temp. Low
Outdoor Status = Off

Error Code = 65
Contents = Heat Sink Sensor (Open/Short)
LED01G = 6 times (Red)
LED02G = 5 times (Green)
Case Of Error = Open / Short circuit
Outdoor Status = Off

Error Code = 67
Contents = Outdoor BLDC Fan Loc
LED01G = 6 times (Red)
LED02G = 7 times (Green)
Case Of Error = Fan Motor/Circuit Problem
Outdoor Status = Off

Error Code = 105
Contents = Comms. Error (Main board Fan board)
LED01G = 6 times (Red)
LED02G = 5 times (Green)
Case Of Error = Poor/Loss of Communication
Outdoor Status = Off

LG Wired LCD Remote Control

3.LG Floor Standing AC Error Codes

LG Floor Standing AC Error Codes

Teach the customer the operation and maintenance procedures, using the operation manual (air filter cleaning, temperature control, etc.).

If Error Code happens in the display of indoor.

Error Code: C0

Error Contents: Indoor Air Sensor Open or Short

Error Code: C1

Error Contents: Indoor Pipe Sensor Open or Short

Error Code: C3

Error Contents: Outdoor Air Sensor Open or Short

Error Code: C4

Error Contents: Outdoor Pipe Sensor Open or Short

Checking Point:

1. Check Sensor Connection to PCB whether it’s connected well or not.
2. Replace it with new Sensor.

Error Code: C5

Error Contents: Communication failure between Indoor and outdoor unit.

Checking Point:

1. Check connecting cable wiring order between Indoor and outdoor diagram.
2. Check all wire connector whether it is connected or not.
3. Indoor AC PCB defects.(short inside).
4. Outdoor PCB defects.(short inside)

4.LG Ceiling Cassette AC Error Codes

LG Ceiling Cassette Error Codes

• The function is to self-diagnoisis airconditioner and express the troubles identifically if there is any trouble.
• Error mark is ON/OFF for the operation LED of evaporator body in the same manner as the following table.
• If more than two troubles occur simultaneously, primarily the highest trouble fo error code is expressed.
• After error occurrence, if error is released, error LED is also released simultaneously.
• To operate again on the occurrence of error code, be sure to turn off the power and then turn on.
• Having or not of error code is different from Model.

Indoor Error;

Error code: 00

Description: No Error

Error code: 01

Description: Indoor Room Thermistor Error

Error code: 02

Description: Indoor In-Piping Error

Error code: 03

Description: Remote controller Error

Error code: 04

Description: Drain Pump Error

Error code: 05

Description: Communication Error between In and Out

Error code: 06

Description: Indoor Out-Piping Error

Outdoor Error;

Error code: 21

Description: DC Peak(IPM Fault)

Error code: 22

Description: CT2(Max CT)

Error code: 23

Description: DC Link Low Volt

Error code: 24

Description: High/Low Pressure/Heatsink Switch

Error code: 25

Description: Low Voltage / Over Voltage

Error code: 26

Description: DC COMP Position Error

Error code: 27

Description: PSC Fault Error

Error code: 28

Description: DC Link High Volt

Error code: 32

Description: D-Pipe High(INV)

Error code: 33

Description: D-Pipe High(Normal)

Error code: 40

Description: CT Sensor(open/short)

Error code: 41

Description: INV. D-Pipe Thermistor Error(Open/Short)

Error code: 44

Description: Outdoor Air Thermistor Error(Open/Short)

Error code: 45

Description: Cond Pipe Thermistor Error(Open/Short)

Error code: 46

Description: Suction Pipe Thermistor Error(Open/Short)

Error code: 47

Description: Const. D-Pipe Thermistor Error(Open/Short)

Error code: 51

Description: Capcity Error(High/Low)

Error code: 53

Description: Signal Error(Indoor_Outdoor)

Error code: 54

Description: Phase Error

Error code: 60

Description: EEPROM Check Sum Error

Error code: 61

Description: Cond Pipe High

Error code: 62

Description: Heatsink High

Error code: 63

Description: Cond Pipe Low

Error code: 65

Description: Heatsink Thermistor Error(Open/Short)

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LG AC Universal Split Fault Codes

Fault code 01: Is a fault with the Indoor unit return air Thermistor

Fault code 02: Is a problem with the Indoor unit coil inlet Thermistor

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

Fault Code 04: Fault code CH04 indicates that the float switch of the fan coil has risen

Fault Code 05: These error codes indicate a communication fault between the indoor and outdoor units; it appears approximately 5 minutes after powering up the system

Fault code 06: Is a problem with the Indoor unit coil outlet Thermistor

Fault Code 07: On Multi split systems, the first unit switched on is the cool heat master, the master tells the condensing unit what to do. If the condenser is in heating and any slave is set to cooling a CH07 fault code will appear

Fault Code 09: Check for loose connections or dry joints where EEPROM connects on Main PCB, repair if possible, if not replace PCB

Fault Code 10: Indoor Fan Motor problem

Fault Code 21: This fault is caused by an over current in the inverters DC power circuit. If the DC part of the circuit exceeds 14 Amps fault code 21 will be displayed

Fault Code 22: This fault is caused by a Compressor over-current see code 21. Please see section on Inverter testing at the end

Fault Code 23: This fault indicates a fault in the DC part of the inverter circuit; it means that the Dc Voltage to the inverter is below 140 V Dc, it should be 370 V for single phase machines and 600 V dc for three phase machines.

Fault Code 25: This fault indicates a problem with the incoming power supply to the system.

Fault Code 26: This fault indicates a problem with the positioning system of the inverter compressor, which indicates a seized compressor.

Fault Code 27: This fault indicates a problem with the inverter module, see section on testing inverters. Also check reactor is connected to the PCB and check its resistance it should be well under 1 Ohm.

Fault Code 28: This fault indicates a problem in the DC part of the inverter circuit; it means that the DC Voltage to the inverter is too high.

Fault Code 29: Check and correct for any:

1. Overload operation (Pipe restrictions / Restricted Airflow / EEV defect / Refrig. Overcharged)
2. Compressor damage (Insulation damage / Motor damage)
3. Input Voltage Low
4. ODU Inverter PCB assembly damage

Fault Code 32: Indicates that the Inverter compressor discharge temperature is high (above 105ºC) this usually indicates the system has either a shortage of refrigerant or a blockage in the system.

Fault Code 33: Indicates that the fixed speed compressor discharge temperature is high (above 105ºC) this usually indicates the system has either a shortage of refrigerant or a blockage in the system.

Fault Code 39: Check and repair or replace as necessary:

1. PCB defect / Wiring defect
2. Different Micom Software Version
3. ODU Inverter PCB assembly damage

Fault Code 40: This fault indicates a problem with the current drawn by the AC part of the inverter circuit.

Fault Code 41: This fault indicates an Inverter Compressor discharge Thermistor fault

Fault Code 44: Indicates a fault with the Outdoor unit air Thermistor

Fault Code 45: Indicates a problem with the condenser coil outlet Thermistor

Fault Code 46: Indicates a problem with the compressor suction Thermistor

Fault Code 47: Indicates an Inverter Compressor discharge Thermistor fault

Fault Code 48: This fault indicates that the compressor discharge sensor and the condenser air temperature sensors are both unplugged. Both these sensors are connected to a single connector on the outdoor unit PCB, plug it in and the fault will go away.

Fault Code 51: This indicates that the capacity of the indoor unit / units is too great for the condensing unit.

Fault Code 52: This fault code indicates a communication error between the Main and Sub micom (CPU’s) on the outdoor unit main PCB.

Fault Code 54: This fault normally indicates a lost phase or the phases are reversed on the power supply to 3 phase units.

Fault Code 60: Check the correct PCB assembly has been installed, check for dry joints, replace outdoor unit PCB if nothing is found.

Fault Code 61: Indicates the outdoor unit condenser coil temperature is high above 65ºC, this will usually be experienced in cooling mode and will indicate insufficient air being drawn over the coil.

Fault Code 62: Indicates the outdoor unit Inverter heat-sink thermistor has detected that the heat sink is overheating 85ºC.

Fault Code 65: Is a problem with the Inverter PCB heat sink thermistor for the heat sink on the outdoor unit PCB

Fault Code 67: This is a problem with the Outdoor Fan Motor, where rotation is not detected, and could be result of either Mechanical or Electrical failure.

Fault Code 73: Check and repair or replace as necessary:

1. Overload operation (Pipe restrictions / Restricted Airflow / EEV defect / Refrig. Overcharged)
2. Compressor damage (Insulation damage / Motor damage)
3. Input Voltage abnormal
4. Power supply wiring abnormal
5. Inverter PCB assembly damage

Fault Code 105: This is due to a Communication error between the Main outdoor PCB and Fan PCB

5.LG PTAC AC Error Codes

LG PTAC AC Error Codes

CH 01: Indoor Air Thermistor Error. Indoor air temperature sensor fault is occurred by indoor air temperature ≤ -35℃ or the indoor air temperature ≥ 100°C

CH 02: Indoor Coil Thermistor Error. Indoor pipe temperature sensor fault is occurred by indoor pipe temperature ≤ -35℃ or the indoor pipe temperature ≥ 100°C

CH 07: Themostat Wiring Error. During operating Remote mode, if PTAC receives control commands that can not be drive from Themostat, Themostat error occurred.

CH 09: EEPROM Check Sum Error. EEPROM Check Sum Error is occurred by unmatching between the original checksum and the calculated checksum.

CH 10: Indoor Fan Error. Indoor fan lock error is occurred by no feedback signal from Hall sensor located BLDC Motor in 50 seconds delay time or feedback signal lower than 50RPM. (Applied in model using BLDC Motor)

CH 34: High Pressure Switch Error. If opening high pressure switch for 65 miliseconds is generated more than 10 times in 1 hour, High Pressure Switch Error occurred.

CH 44: Outdoor Air Thermistor Error (PTHP Only). Outdoor air temperature sensor fault is occurred by outdoor air temperature ≤ -35℃ or the indoor air temperature ≥ 100°C

CH 45: Outdoor Coil Thermistor Error (PTHP Only). Outdoor pipe temperature sensor fault is occurred by outdoor pipe temperature ≤ -35℃ or the outdoor pipe temperature ≥ 100°C

CH 67: Outdoor Fan Error. Outdoor fan lock error is occurred by no feedback signal from Hall sensor located BLDC Motor in 50 seconds delay time or feedback signal lower than 50RPM. (Applied in model using BLDC Motor)

6.LG Portable Air Conditioner Error Codes

Before you call for service, review this list. It may save you time and expense. This list includes common occurrences that are not the result of a defect in workmanship or materials.

LG Portable Air Conditioner Error Codes

FL: The water collection tank is full : Empty the water collection tank. See the care and Cleaning section.

E1: Short or open circuit in the indoor air thermostat : Unplug the air conditioner and contact your authorized LG service center.

E2: Short or open circuit in the indoor pipe thermostat : Unplug the air conditioner and contact your authorized LG service center.

Before Calling For Service

LG Portable AC Cleaning The Air Filter

LG Portable Air Conditioner Cleaning The Air Filter

LG Portable AC Emptying The Water Collection Tank (FL Error Solution)

When the internal water collection tank is full, FL will appear in the display and the air conditioner will turn off untill the tank is emptied.

LG Portable Air Conditioner Emptying The Water Collection Tank (FL Error Solution)

LG Portable Air Conditioner Emptying The Water Collection Tank (FL Error Solution)_2

7.LG AC Troubleshooting 

LG AC Troubleshooting

The air conditioner may be operating abnormally when:

Problem: Air conditioner does not start

Possible Causes:

1. The air conditioner is unplugged.
2. The fuse is blown/circuit breaker is tripped.
3. Power failure.
4. High voltage.

What To Do:

1. Make sure the air conditioner plug is pushed completely into the outlet.
2. Check the house fuse/circuit breaker box and replace the fuse or reset the breaker.
3. If power failure occurs, turn the mode control to OFF. When power is restored, wait 3 minutes to restart the air conditioner to prevent tripping of the compressor overload.
4. If the voltage is unusually very high or low the circuit Breaker will trip.

Problem: Air conditioner does not cool as it should

Possible Causes:

1. Airflow is restricted.
2. The air filter is dirty.
3. The room may have been hot.
4. Cold air is escaping.
5. Check the temperature settings.
6. There might be any heating source in the room.

What To Do:

1. Make sure there are no curtains, blinds, or furniture blocking the front of the air conditioner.
2. Clean the filter at least every 2 weeks. See the Maintenance and Service section.
3. When the air conditioner is first turned on, you need to allow time for the room to cool down.
4. Check for open furnace floor registers and cold air returns.
5. Make sure they are correct.
6. Check and remove such source or turn it off while using the air conditioner.

Call the service immediately in the following situations

1. Anything abnormal such as burning smell, loud noise etc. happen. Stop the unit and turn the breaker off. Never try to repair by yourself or restart the system in such cases.
2. Main power cord is too hot or damaged.
3. Error code is generated by self diagnosis.
4. Water leaks from indoor unit even if the humidity is low.
5. Any switch, breaker (safety, earth) or fuse fails to work properly