LG Split System Air Conditioner Error Codes – Troubleshooting – Maintenance

Full list of LG Air Conditioner Multi Split Units and Inverter Fault Codes. When error codes appear on the LG AC remote control or the LG AC LED panel wall unit, this tells the user there’s a problem with the LG AC unit. The error code that is displayed will tell you the issue or problem that occurring with the AC.

Knowing what the error code means or its definition will help you to understand and troubleshoot the exact part that needs to be fixed, repaired, cleaned, or replaced. You can then clean, fix, or replace the part yourself therefore saving money.

LG Split System Air Conditioner Error Codes - Troubleshooting - MaintenanceLG Split System Air Conditioner Error Codes – Troubleshooting – Maintenance

LG AC WALL MOUNTED

When there is a fault or error in your LG AC unit a 2, 3 or 4 digit code will show on the remote control led display. If your LG AC unit does not have a remote control that came with the unit, then the 2, 3 or 4 digit error code will display on the LED panel on the front of the indoor unit.

LG AC Location of LEDsLG AC Location of LEDs

NOTE: If more than two errors occur at the same exact time, the lower numbered error code will be shown on the display first.

The first 3 LG AC errors are the most commonly reported – This is why they are listed first and out of order = These are Lights FlashingCH05CH10

LG Air Conditioner Error = Lights Flashing
-Switch off the circuit breaker in your AC unit and then switch it on again.
-If there is no loose connection your air conditioner will start its operations normally.
-Check wiring connections for any loose connection on the unit.
-A low refrigerant charge can cause the air conditioner light to blink.

LG Split System Air Conditioner Error code = C5 or CH05
LG AC Fault Definition = Communication between indoor and outdoor units
Flashing Light = 5
Display = Indoor Outdoor
Indoor Operation = OFF

LG Split System Air Conditioner Error code = CA or CH10
LG AC Fault Definition = Discharge temp more than 130 °C – Faulty discharge thermistor
Flashing Light = 10
Display = Indoor Outdoor
Indoor Operation = ON

LG Air Conditioner Parts To Fix Error CodesLG Air Conditioner Parts To Fix Error Codes

LG Split System Air Conditioner Error code = C1 or CH01
LG AC Fault Definition = Indoor temperature sensor open or closed circuit
Light Will Flash = 1
Display = Indoor
Indoor Operation = ON

LG Split System Air Conditioner Error code = C2 or CH02
LG AC Fault Definition = Outdoor temperature sensor open or closed circuit – Outdoor air or piping temperature thermistor error
(Measured the resistance of the two thermistors)
Flashing Light = 2
Display = Indoor Outdoor
Indoor Operation = ON

LG Split System Air Conditioner Error code = C3 or CH03
LG AC Fault Definition = Communication (Indoor Wired R/Control) Data Communication Fault
Flashing Light = 3

LG Split System Air Conditioner Error code = C4 or CH04
LG AC Fault Definition = Heat-sink temperature sensor open or closed circuit
Flashing Light = 4
Display = Indoor Outdoor
Indoor Operation = ON

LG Split System Air Conditioner Error code = C5 or CH05
LG AC Fault Definition = Communication between indoor and outdoor units
Flashing Light = 5
Display = Indoor Outdoor
Indoor Operation = OFF

LG Split System Air Conditioner Error code = C6 or CH06
LG AC Fault Definition = Excessive current at inverter DC power circuit – DC Peak Power
Flashing Light = 6
Display = Indoor Outdoor
Indoor Operation = SHUTDOWN

LG Split System Air Conditioner Error code = C7 or CH07
LG AC Fault Definition = Excessive compressor current
Flashing Light = 7
Display = Indoor Outdoor
Indoor Operation = SHUTDOWN

LG Split System Air Conditioner Error code = C8 or CH08
LG AC Fault Definition = Indoor fan not rotating
Flashing Light = 8
Display = Indoor
Indoor Operation = OFF

LG Split System Air Conditioner Error code = C9 or CH09
LG AC Fault Definition = Outdoor fan not rotating
Flashing Light = 9
Display = Indoor Outdoor
Indoor Operation = OFF

LG Split System Air Conditioner Error code = CA or CH10
LG AC Fault Definition = Discharge temp more than 130 °C – Faulty discharge thermistor
Flashing Light = 10
Display = Indoor Outdoor
Indoor Operation = ON

LG Split System Air Conditioner Error code = Flashing CH32
LG AC Fault Definition = Discharge temperature is high – Unit may be low on refrigerant or airflow is blocked – dirty coil or air filter
Display = Indoor

LG Split System Air Conditioner Error code = CC
LG AC Fault Definition = EEPROM error
Flashing Light = 2+1
Display = Outdoor
Indoor Operation = ON

LG Split System Air Conditioner Error code = CD
LG AC Fault Definition = Inverter module error
Flashing Light = 3+1
Display = Outdoor
Indoor Operation = ON

LG Split System Air Conditioner Error code = CL
LG AC Fault Definition = Child Lock Function selected – Not an error – Press Timer and Min buttons at same time for 3 seconds to toggle On/Off
Indoor Status = On

LG Split System Air Conditioner Error code = HL
LG AC Fault Definition = High Limit (Float Switch) – Float switch Open circuit
Indoor Status = Off

LG Split System Air Conditioner Error code = Po
LG AC Fault Definition = System in Power Mode – (not a fault)
Display = Indoor

LG Split System Air Conditioner Error code = Lo
LG AC Fault Definition = System in test mode (not a fault)
Display = Indoor

LG Split System Air Conditioner Error code = 01
LG AC Fault Definition = Air sensor (open/short) – Open / Short circuit
Indoor Status = Off

LG Split System Air Conditioner Error code = 02
LG AC Fault Definition = Inlet pipe sensor – Open / Short circuit
Indoor Status = Off

LG Split System Air Conditioner Error code = 03
LG AC Fault Definition = Communication (Indoor Wired R/Control) – Communication Issue
Indoor Status = Off

LG Split System Air Conditioner Error code = 04
LG AC Fault Definition = Drain pump / Float switch – Float switch Open circuit (High level water alarm)
Indoor Status = Off

LG Split System Air Conditioner Error code = 05
LG AC Fault Definition = Communication(Indoor Outdoor) – Communication Issue
Indoor Status = Off

LG Split System Air Conditioner Error code = 06
LG AC Fault Definition = Outlet pipe sensor – Open / Short circuit
Indoor Status = Off

LG Split System Air Conditioner Error code = 07
LG AC Fault Definition = Different operation mode – Indoor units set in different operation modes
Indoor Status = Off

LG Split System Air Conditioner Error code = 21
LG AC Fault Definition = (Compressor Over-current) – Compressor malfunction, IPM Fault
LED01G = 2 times (Red)
LED02G = 1 time (Green)
Outdoor Status = Off

LG Split System Air Conditioner Error code = 22
LG AC Fault Definition = CT 2 Max. Current – Current is 14A
LED01G = 2 times (Red)
LED02G = 2 times (Green)
Outdoor Status = Off

LG Split System Air Conditioner Error code = 23
LG AC Fault Definition = DC Link Low Volt – DC Link volt
LED01G = 2 times (Red)
LED02G = 3 times (Green)
Outdoor Status = Off

LG Split System Air Conditioner Error code = 24
LG AC Fault Definition = Low / High Pressure – Low / High press switch OPEN
LED01G = 2 times (Red)
LED02G = 4 times (Green)
Outdoor Status = Off

LG Split System Air Conditioner Error code = 25
LG AC Fault Definition = AC Low / AC High Voltage – Abnormal AC volt input
LED01G = 2 times (Red)
LED02G = 5 times (Green)
Outdoor Status = Off

LG Split System Air Conditioner Error code = 26
LG AC Fault Definition = DC Compressor Position
LED01G = 2 times (Red)
LED02G = 6 times (Green)
Outdoor Status = Off

LG Split System Air Conditioner Error code = 27
LG AC Fault Definition = PSC Fault (Reactor)
LED01G = 2 times (Red)
LED02G = 7 times (Green)
Outdoor Status = Off

LG Split System Air Conditioner Error code = 28
LG AC Fault Definition = DC Link High Volts – DC Link Voltage is 420V
LED01G = 2 times (Red)
LED02G = 8 times (Green)
Outdoor Status = Off

LG Split System Air Conditioner Error code = 32
LG AC Fault Definition = Discharge Pipe Temp High (INV)
LED01G = 3 times (Red)
LED02G = 2 times (Green)
Outdoor Status = Off

LG Split System Air Conditioner Error code = 33
LG AC Fault Definition = Discharge Pipe Temp High (Cons)
LED01G = 3 times (Red)
LED02G = 3 times (Green)
Outdoor Status = Off

LG Split System Air Conditioner Error code = 40
LG AC Fault Definition = CT Circuit malfunction
LED01G = 4 times (Red)
Outdoor Status = Off

LG Split System Air Conditioner Error code = 41
LG AC Fault Definition = D-Pipe sensor INV (Open/Short) – Open / Short circuit
LED01G = 4 times (Red)
LED02G = 1 time (Green)
Outdoor Status = Off

LG Split System Air Conditioner Error code = 44
LG AC Fault Definition = Air sensor Open / Short circuit
LED01G = 4 times (Red)
LED02G = 4 times (Green)
Outdoor Status = Off

LG Split System Air Conditioner Error code = 45
LG AC Fault Definition = Cond. Pipe Sensor Open / Short circuit
LED01G = 4 times (Red)
LED02G = 5 times (Green)
Outdoor Status = Off

LG Split System Air Conditioner Error code = 46
LG AC Fault Definition = Suction Pipe Sensor Open / Short circuit
LED01G = 4 times (Red)
LED02G = 6 times (Green)
Outdoor Status = Off

LG Split System Air Conditioner Error code = 47
LG AC Fault Definition = D-pipe Sensor Cons Open / Short circuit
LED01G = 4 times (Red)
LED02G = 7 times (Green)
Outdoor Status = Off

LG Split System Air Conditioner Error code = 48
LG AC Fault Definition = D-Pipe & Air Sensor (Open) – Dual Sensor unplugged
LED01G = 4 times (Red)
LED02G = 8 times (Green)
Outdoor Status = Off

LG Split System Air Conditioner Error code = 51
LG AC Fault Definition = Over Capacity – Over Load Combination
LED01G = 5 times (Red)
LED02G = 1 times (Green)
Outdoor Status = Off

LG Split System Air Conditioner Error code = 52
LG AC Fault Definition = Communication Error (Main micom Sub micom) – Poor/Loss of Communication
LED01G = 5 times (Red)
LED02G = 2 times (Green)
Outdoor Status = 0ff

LG Split System Air Conditioner Error code = 53
LG AC Fault Definition = Communication Error (Indoor Outdoor) – Poor/Loss of Communication
LED01G = 5 times (Red)
LED02G = 3 times (Green)
Outdoor Status = Off

LG Split System Air Conditioner Error code = 54
LG AC Fault Definition = Outdoor 3-Phase Power Supply Reverse Phase / Missing Phase – Incorrect Wiring
LED01G = 5 times (Red)
LED02G = 4 times (Green)
Outdoor Status = Off

LG Split System Air Conditioner Error code = 60
LG AC Fault Definition = EEPROM Check Sum – Check Sum Mismatch
LED01G = 6 times (Red)
LED02G = (Green)
Outdoor Status = Off

LG Split System Air Conditioner Error code = 61
LG AC Fault Definition = Cond Pipe Sensor Temp High – Cond Temp High
LED01G = 6 times (Red)
LED02G = 1 time (Green)
Outdoor Status = Off

LG Split System Air Conditioner Error code = 62
LG AC Fault Definition = Heat-Sink Sensor Temp High
LED01G = 6 times (Red)
LED02G = 2 times (Green)
Outdoor Status = Off

LG Split System Air Conditioner Error code = 63
LG AC Fault Definition = Cond Pipe Sensor Temp Low
LED01G = 6 times (Red)
LED02G = 2 times (Green)
Outdoor Status = Off

LG Split System Air Conditioner Error code = 65
LG AC Fault Definition = Heat-Sink Sensor Open / Short circuit
LED01G = 6 times (Red)
LED02G = 5 times (Green)
Outdoor Status = Off

LG Split System Air Conditioner Error code = 67
LG AC Fault Definition = Outdoor BLDC Fan Lock – Fan Motor/Circuit Problem
LED01G = 6 times (Red)
LED02G = 7 times (Green)
Outdoor Status = Off

LG Split System Air Conditioner Error code = 105
LG AC Fault Definition = Comms Error (Main board Fan board) – Poor/Loss of Communication
LED01G = 6 times (Red)
LED02G = 5 times (Green)
Outdoor Status = Off

LG AC Split System Error Charts and Lists
LG Split System Air Conditioner Error IndicatorsLG Split System Air Conditioner Error Indicators

LG Split System Air Conditioner Error Codes 1LG Split System Air Conditioner Error Codes 1

LG Split System Air Conditioner Error Codes 2LG Split System Air Conditioner Error Codes 2

LG Split System Air Conditioner Error Codes 3LG Split System Air Conditioner Error Codes 3

LG AC Inverter Error Charts and Lists

LG Inverter Air Conditioner Error Codes 1LG Inverter Air Conditioner Error Codes 1

LG Inverter Air Conditioner Error Codes 2LG Inverter Air Conditioner Error Codes 2

 

DOWNLOAD: LG Air Conditioner Split System Error Codes PDF File


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LG Air Conditioning: How To Use The Remote Control


LG Air Conditioners: Split AC Filter Cleaning


LG Split Air Conditioners: Auto Clean Feature – Smelly AC Air


LG Split Air Conditioners: Noisy AC Issues


61 thoughts on “LG Split System Air Conditioner Error Codes – Troubleshooting – Maintenance”

  1. No error codes, but I am getting beeping sound around every 14 minutes. Just wondering what could be causing it .

  2. LG mini split 186 has error code CH26. Does this require a replacement compressor to correct?

  3. I have a lg dual inverter heat pump that is flashing code CH29 what does this mean and is it something that i can reset or fix on my own no tech’s in the area thanks

  4. My LG duel interter heat pump model number #LAN120HYV1 is giving me error cod CH37, I cannot locate the issue or find any answers online or in the manual, please help.

  5. Graham Mullucks

    I have an LG dual inverter air conditioner unit, bought and installed in september 2020, the problem is when switched on heat CH73 comes on and I have to switch power off for 20 minutes, then switch on OK, the outside unit is above front door and water comes out all the time and drops on people at the door. I have this problem every 2-3 days, this is a new unit and should be covered by guarantee. I live in spain but I am English and do not speak spanish.

  6. Hi guys anyone help me? I have Lg inverter ac 1.5ton, last 3 days I’m facing CH62 error code. I checked the sensor and cleaned and fixed it. 1 day it runs smooth the next day same error came. Anyone can help?

  7. Hi. I have a LSN120HEV1, 2 years old. Had a power bump and now the units don’t kick on. I replaced both boards (inside and out) and now the indoor unit has the preheating light lit and the outdoor unit has a solid red LED on the board. I look all over the place for a fix or direction to go but nothing. Can you help?

  8. Thanks a lot I used LO error code to fix my LG Split AC. The Handbook Did not have LO written against the Test Mode .But your site had it . So very Helpful. Thanks

  9. The a.c works for 10mins then shows CH21 and stop working. I have to switch it off and on from the socket for it to work again. And still it stops after 10mins

  10. I have a dual heater/ac. There is no error code but on the heat setting the vent almost closes and blows cold air. I have tried all the settings for different positions for the vent but it always goes back to almost closed and blows cold air. I have tried turning off at breaker unit to reset but it still did the same? Any advice grateful.

  11. akindele akingbogun

    there is leakage during installation of inverter split unit,after fixing the leakage and refilling the unit the CH 38 displayed on the screen even after adding more refrigerant,after a while the system shut down,anytime i try to power the unit the CH 38 will display,pls what is the solution,thanks

  12. akindele akingbogun

    i have the same issue as complained above,there is a leakage during installation and the CH 38 show during refilling and the system shut down immediately so should add more refrigerant into the system ? thanks

  13. If the refrigerant level goes lower than 40 percent in a case of any leakage, the AC is immediately shut down with an alert of CH 38 on the screen

  14. Salvador B. Cabansay

    I have a LG dual inverter model NT187Sk3, the unit have an alarmed code CH 38, what is the
    cause of this alarm code, several times i checked the unit, i need your opinion about this matter, thanks.

  15. I have a LG split air unit that now has a error code of ( CA ) and does not cool. one error code i found says its a Faulty discharge thermistor. How can i find this part on the unit to replace it.

  16. i have a problem in LG MODEL LT-C-186 ELEI with signal wire when using generator,only the fan fan motor work indoor but in outdoor show no reaction until we use the normal electrical power

  17. i have error code S5 in my split LG dual inverter (model no:BS-Q186K3A1) ,indoor is running n outdoor not working anymore..

  18. Same problem here, can’t find anything to explain what “ch37” is. Outside temp was a little below zero but windchill here was about 20 below. I’m assuming this was the cause and hoping it’s temporary?!? Outside temp now is in the 30’s and still getting the same error code. Hoping it just needs more time to warm up. Frustrating since this unit is rated to minus 14F!

  19. Hi guys, my Inverter V is showing the communications error with the 5 flashes.

    Is this something I can look at fixing myself? Ie a loose connection somewhere between the indoor and outdoor units?

  20. Anyone have an idea how to repair a code 5 – indoor unit not communicating with outdoor unit? Green LED flashes 5 times. Thanks.

  21. I have an LG P18RK EU1 (ASUW186C8A0) unit which just stops. There are three white LED lights but I cannot find any information on the fault codes displayed.

    When the unit stops upper LED (Power) flashes once followed by middle LED (E/control) flashes twice followed by upper LED (Power) flashing once more. Lower LED (Preheat) does not flash.

    Can anybody advise as LG are proving useless?

  22. secundino silva

    Good morning, I also have the same problem with my wall mounted device LG has the error code CH 38 and I can not find the resolution of this problem

  23. I have a C6 error. We are experiencing an ice storm. I can’t get to the outdoor unit because there is ice on the rooftop. The indoor unit has shut down. Is it possible that the ice has incapacitated the unit? Will I simply need to wait for the snow to melt or should I do something else?

  24. lg lan180 and lau180hsv no heat,the power light is on the preheat light is on the fan is running but no heat with remote set to heat and temp set to 80 have any idea? are there any troubleshooting manuals available? i’m having a hard time finding info on these units can you direct me to info sites or availability

    thanks
    dl

  25. Just installed 3 6000 and 1 18000 units, new condenser,
    units cool fine . . . but when in auto mode units do not cool or heat, been told all units must be in same mode for them to work . . . this is NOT TRUE. they don’t work correctly except in cool mode.
    Only one tech on LG ductless havoc mili splits in 200 miles . . . am stuck with them to keep my guarantee alive. LG has proven to me to have one of the weakest electircal designs in the business. . . why would one on a mini split with 4 heads have to operate all of them in same mode? defeats the reason to have individual room haves. ABOUT DECIDED that LG is total junk . . . i am out 5000, will have to spend another 7000 for a mitsubishi product that have several local techs and works.

  26. my lg ac does the same thing shows error code ch 38 shuts down i have 5 of the same models this is the only one that does it Why

  27. I have a 2 unit LG ductless mini split (LSN090HSV4-Living room, LMN078HVT-bedroom). The entire condenser turns off after running for a little while and both units will flash 3x (LED1/Heating) and 5x (LED2/Cooling). I don’t find the code or codes for this error message. Since the main condenser goes off and both flash the same error code, I’m assuming it’s something with the entire system. Could anyone please advise and help?! I’d really appreciate any insight. THANKS!

  28. We have a problem with the LG Split System Air Conditioner. The indoor unit gives error code C5. The outdoor unit does not work. Can you indicate which part needs to be replaced?

  29. I’ve a problem LG ceiling cassette air-conditioner… It comes red 1 , green 5. What error code is that????

  30. I have LG Split Air Conditioners and this Error Code appear in the indoor unit screen ( P 10 ) I’dont now what is that mean? and the Split not work. Would you please advise what could be the problem?

  31. john sorensen

    LG Split Air Conditioner shows error code CH 38.
    Talked with LG Mexico and the error is for lack of Gas, it leaked out.
    Called in the Gas guy, refilled and found leak, and now the AC works again. Nice.

  32. I have the same problem on my new AC LG Smart Inverter model no. JS-Q12MPXD.
    As soon I switch it on it shows an error of CH38 and doesn’t work.

  33. I HAVE 1.5 TONNE LG DUAL INVERT ER SPLIT AC. GIVEN ERROR CODE CH12 AND SOME TIMES CH10, PLEASE SEND ME SOLUTION . AC UNDER WARRANTY CONDITION.

  34. What do I check for a 5flash communication error other than grounds and wiring for LG AC? These two seem to be good. What about the computer board? How do I troubleshoot that?

  35. I have a LG split unit. I have changed the board and fan motor per lgs request. The outside unit still does nothing. I also have a diagnostic reader and the lights don’t even come on when I hook it up. Does anyone have any ideas?

  36. I have a LG mini split. When you set it for cooling both indoor and outdoor work just fine for about 5 mins. Then indoor flashes communication fault (5) flashes. When you try and shit if off my the remote, the indoor unit display turns off and the supply damper shuts closed but indoor fan keeps running as well as the outdoor unit (compressor and all). Until you kill high voltage.
    lsn186he (indoor)
    Lsu186he (outdoor)

  37. I have a same problem with my new AC LG Smart inverter modrl LGDM12RP. AC stopped suddenly and it shows CH38? Remote control doesnt react to other options. Would you please advise what could be the problem?

  38. I have the lsn120hsv4. Whenever it is off, I can hear a low pitch constant squeal from it. It’s very faint but can be heard easily if the house is silent. I know its coming from the unit as it stops when the breaker is turned off. I cannot hear it when its running, just in an off state. Is this normal? It can be annoying once you hear it, hard to stop.

  39. I’ll give that a shot – it’s only 3 months old, but it’s a sort-of dusty environment.

  40. DIY Project Help Tips

    Josh,
    Sounds like the compressor is faulty.
    Check this LG AC PDF file here and it explains the error code 21.
    OR
    Possibly the filter is dirty and needs cleaned and the ac needs vacuumed out.
    Is the inside of the AC dirty? Pet hair? Dust? Dirt?
    A dirty filter and dusty inner part of the AC can cause multiple error codes.
    Unplug it, Clean it out, wait 30 minutes, and apply power and test it.
    -RR

  41. My LG mini-split AC system blinks code 21.
    Pressing the buttons on the remote doesn’t do anything.
    After turning off the breaker for a minute and turning back on, it runs for 10-15 minutes, but not nearly as cold as it used to be, then shuts off and blinks 21 again.
    Any ideas?
    The model is LG lsn307hv3.

  42. i have this promblem to – my LG AC model is -np277sk1-(next plus 2) the newest model of lg ACs – i bought it last week but know some times it showing ch38 and stops working

  43. DIY Project Help Tips

    Ibrahim,
    Try this…
    – Remove power to your LG Split System AC Model BS-Q096J3A2 wall unit.
    – Remove front panel and clean the filter and the surrounding areas.
    – Reinstall the AC air filter.
    – Leave AC unplugged for an hour or more.
    – Reapply power to the LG wall unit and run a test…. This should clear the error code CH 38.

    NOTE: Be sure you work safely as certain parts in the AC, even though unplugged, can still be energized.

    Let us know what you find after doing the above.
    -RR

  44. It only works for 10-20 minutes and then it stops working, then starts showing error code ch 38.

  45. DIY Project Help Tips

    Ibrahim,
    What is the issue with your LG Split System AC Model BS-Q096J3A2?
    Still getting error code CH38?
    Is it cooling?
    No power?
    Remote not responding?
    -RR

  46. DIY Project Help Tips

    Ibrahim,
    The error code CH38 is not in the database as an error code for LG Split System Air Conditioners.
    Can you tell us the model number of your LG AC?
    We will then research the model number and code and try to find you an answer.
    -RR

  47. My LG AC shows CH38 after working for 5-10 minutes and then stops working.
    Is this an invented error code?
    CH38 is not on the list.

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