LG Air Conditioner Error Codes – Causes and Solutions

LG Corporation, also known as LG Group is a Korean-based multinational corporation that came into being under the name Lucky Goldstar. The company first took off in 1983 and got a complete revamp in 1995, changing its name to LG Corporation. Based in South Korea the corporation was founded by Koo Inhwoi, and managed by his generations to come. What started as a family business now provides energy solutions for more than 80 countries.

Today, LG offers a wide range of air conditioners that are designed keeping top-of-the-line technology and fashion-forward style in mind. Offering you everyday comfort with a simple yet powerful tool in your home or office space. With its wide range of ACs, you are sure to find one that matches your current requirements.

LG ACs are a great choice, but there are times when you may face a minor or major error code in the system. While there is no way of knowing an error may occur, all you can do is handle it in a way that works best for you. Start by noting down the error code, and match it using the list below. Once you have the error code you can easily work your way to the fix. To help you out we have listed down some of the most common error codes for LG ACs.

Split Type AC

Error CodesCause
C1 or CH1Indoor temperature sensor open or closed circuit.
C2 or CH2Outdoor temperature sensor open or closed circuit.
C4 or CH4Heat sink temperature sensor open or closed circuit.
C5 or CH5Communication between indoor and outdoor units.
C6 or CH6Excessive current at inverter DC power circuit.
C7 or CH7Excessive compressor current
C8 or CH8Indoor fan not rotating.
C9 or CH9Outdoor fan not rotating.
CA1. Discharge temp more than130 °C 2. Faulty discharge thermistor
CCEEPROM error
CDInverter module error
PoSystem in Power Mode – not a fault
LoSystem in test mode – not a fault

Multi Type AC

LG Multi Type AC Error Codes
LG Multi Type AC Error Codes
Error CodesMeaning
01Air sensor (open/short). Open / Short circuit.
02Inlet pipe sensor. Open / Short circuit.
03Communication(Indoor Wired R/Control). Communication Poorly.
04Drain pump / Float switch. Float switch Open circuit (High level water alarm).
05Communication(Indoor Outdoor). Communication Poorly.
06Outlet pipe sensor. Open / Short circuit.
07Different operation mode. Indoor units set in different operation modes.
21IPM Fault (Compressor Over current). Compressor malfunction, IPM Fault.
22CT 2 (Max. Current). Current is 14A.
23DC Link Low Volt. DC Link volt. Is 140V.
24Low / High Pressure. Low / High press switch OPEN.
25AC Low / AC High Volts. Abnormal AC volt. Input.
26DC Compressor Position.
27PSC Fault (Reactor).
28DC Link High Volts.
32Discharge Pipe Temp. High (INV).
33Discharge Pipe Temp. High (Cons.)
40CT Circuit.
41D-Pipe sensor INV. (Open/Short).
44Air sensor (Open/Short).
45Cond. Pipe Sensor (Open/Short).
46Suction Pipe Sensor (Open/Short).
47D-pipe Sensor Cons. (Open/Short).
48D-Pipe & Air Sensor (Open). Dual Sensor unplugged.
51Over Capacity. Over Load Combination.
52Communication Error (Main micom Sub micom). Poor/Loss of Communication.
53Communication Error (Indoor Outdoor). Poor/Loss of Communication.
54Outdoor 3-Phase Power Supply Reverse Phase / Missing Phase. Incorrect Wiring.
60EEPROM Check Sum. Check Sum Mis-Match.
61Cond. Pipe Sensor Temp. High.
62Heat Sink Sensor Temp. High.
63Cond. Pipe Sensor Temp. Low.
65Heat Sink Sensor (Open/Short).
67Outdoor BLDC Fan Loc. Fan Motor/Circuit Problem.
105Comms. Error (Main board Fan board).
HLHigh Limit (Float Switch). Same as code 04, Float switch Open circuit.
CLChild Lock Function selected. Not an error, press Timer and Min buttons simultaneously for 3 seconds to toggle On/Off.
LG Wired LCD Remote Control
LG Wired LCD Remote Control

Floor Standing AC

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 CodeContent
C0Indoor Air Sensor Open or Short
C1Indoor Pipe Sensor Open or Short
C3Outdoor Air Sensor Open or Short
C4Outdoor 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.
C5Communication 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)

Ceiling Cassette AC

LG Ceiling Cassette Error Codes
LG Ceiling Cassette Error Codes
  1. The function is to self-diagnosis air conditioner and express the troubles identically if there is any trouble.
  2. Error mark is ON/OFF for the operation LED of evaporator body in the same manner as the following table.
  3. If more than two troubles occur simultaneously, primarily the highest troubleshooting error code is expressed.
  4. After error occurrence, if error is released, error LED is also released simultaneously.
  5. To operate again on the occurrence of error code, be sure to turn off the power and then turn on.
  6. Having or not of error code is different from Model.
Error codeDescription
00No Error
01Indoor Room Thermistor Error
02Indoor In-Piping Error
03Remote controller Error
04Drain Pump Error
05Communication Error between In and Out
06Indoor Out-Piping Error
21DC Peak(IPM Fault)
22CT2(Max CT)
23DC Link Low Volt
24High/Low Pressure/Heatsink Switch
25Low Voltage / Over Voltage
26DC COMP Position Error
27PSC Fault Error
28DC Link High Volt
32D-Pipe High(INV)
33D-Pipe High(Normal)
40CT Sensor(open/short)
41INV. D-Pipe Thermistor Error(Open/Short)
44Outdoor Air Thermistor Error(Open/Short)
45Cond Pipe Thermistor Error(Open/Short)
46Suction Pipe Thermistor Error(Open/Short)
47Const. D-Pipe Thermistor Error(Open/Short)
51Capacity Error(High/Low)
53Signal Error(Indoor-Outdoor)
54Phase Error
60EEPROM Check Sum Error
61Cond. Pipe High
62Heatsink High
63Cond. Pipe Low
65Heatsink Thermistor Error(Open/Short)
LG AC Remote Control Operations
LG AC Remote Control Operations

PTAC AC

LG PTAC Error Codes
LG PTAC AC Error Codes
ErrorSolution
CH 01Indoor Air Thermistor Error. Indoor air temperature sensor fault is occurred by indoor air temperature ≤ -35℃ or the indoor air temperature ≥ 100°C
CH 02Indoor Coil Thermistor Error. Indoor pipe temperature sensor fault is occurred by indoor pipe temperature ≤ -35℃ or the indoor pipe temperature ≥ 100°C
CH 07Themostat Wiring Error. During operating Remote mode, if PTAC receives control commands that can not be drive from Themostat, Themostat error occurred.
CH 09EEPROM Check Sum Error. EEPROM Check Sum Error is occurred by unmatching between the original checksum and the calculated checksum.
CH 10Indoor 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 34High 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 44Outdoor 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 45Outdoor 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 67Outdoor 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)

Portable AC 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
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
Before Calling For Service

LG Portable AC Cleaning The Air Filter

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

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

Manuals PDF

LG Checkpoint Codes List  PDF

LG Room Air Conditioner Owners Manual PDF

LG Floor Standing Air Conditioner MANUAL

LG Inverter Air Conditioner Error Codes List PDF

Danny Reese



*If you can't find the code you're looking for on our site, please let us know, and we'll update our database as soon as possible.

60 thoughts on “LG Air Conditioner Error Codes – Causes and Solutions”

  1. Please help me out what is the meaning of error code ch38
    My ac shut down after working for like 2 hours and comes up with error code ch38. Kindly advise

    Reply

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