LG AC Error Codes List | LG AC Troubleshooting Guide

LG AC Error Codes List | LG AC Troubleshooting Guide

In this post, we are going to provide you complete LG AC error codes list.

 

 

LG Universal Split AC Error Codes

Indoor Unit Faults:

Error Codes Problems Causes Indoor Unit Status
CH01 Air sensor Problem Open / Short circuit Off
CH02 Inlet Pipe Sensor Problem Open / Short circuit Off
CH03 Communication Error between wire controller remote – IDU Communication Poor Off
CH04 Drain Pump Problem          Float switch Open circuit              (High-level water alarm) Off
CH05 Communication problem between IDU – ODU Communication Poorly Off
CH06 Outlet pipe sensor problem Open / Short circuit Off
CH07 Different Operation Mode  Indoor units are set in different operation modes Off
CH09 Checksum Error Defective PCB or EEPROM Connections Off
CH10 Indoor Motor Fan Lock  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 On Not an error, press the Timer & Min buttons for 3 sec to toggle On/Off On
Po Jet Cool Mode On Not an error, press the Jet Cool button to toggle On/Off On

 

Outdoor Unit Faults:

Error Codes Problems Causes LED Red  LED Green Outdoor  Status
CH21 IPM Problem Compressor malfunction, IPM Fault 2 times 1 time Off
CH22 CT 2 (Max Current) Current is 14A ↑ 2 times 2 times Off
CH23 DC Link Low Volt. DC Link volt. Is 140V ↓ 2 times 3 times Off
CH24 Low / High Pressure Low / High press switch OPEN 2 times 4 times Off
CH25 AC Low / AC High Volts Abnormal AC volt. Input. 2 times 5 times Off
CH26 DC Compressor Position 2 times 6 times Off
CH27 PSC Fault (Reactor) 2 times 7 times Off
CH28 DC Link High Volts Off 2 times 8 times Off
CH29 Compressor Over Current Problem Inverter Compressor input
current is over 30A
2 times 9 times Off
CH32 High Discharge Pipe Temperature (INV) D-Pipe Temp (Inv.) >105°C 3 times 2 times Off
CH33 High Discharge Pipe Temperature D-Pipe Temp (Const) >105°C 3 times 3 times Off
CH34 Safety Relay Power down due to the abnormal pressure in the sealed unit Off
CH39 Communication Error Communication Error
Between PFC and INV PCB
3 times 9 times Off
CH40 CT Circuit Problem CT Circuit malfunction 4 times Off
CH41 D-Pipe sensor INV Open / Short circuit. 4 times 1 time Off
CH44 Air sensor (Open/Short) Open / Short circuit 4 times 4 times Off
CH45 Cond. Pipe Sensor  Open / Short circuit 4 times 5 times Off
CH46 Suction Pipe Sensor Problem Open / Short circuit 4 times 6 times Off
CH47 D-pipe Sensor Cons. Open / Short circuit 4 times 7 times Off
CH48 D-Pipe & Air Sensor Dual Sensor unplugged 4 times 8 times Off
CH50 Outdoor unit phase connection error –  Off
CH51 Over Capacity Over Load Combination 5 times 1 time Off
CH52        Communication Error   (Main micom↔Sub micom) Poor/Loss of Communication 5 times 2 times Off
CH53 Communication Error (Indoor ↔
Outdoor)
Poor/Loss of Communication 5 times 3 times Off
CH54 Outdoor 3-Phase Problem
Reverse / Missing Phase
Incorrect Wiring Problem 5 times 4 times Off
CH60 EEPROM Check Sum Check Sum Mis-Match 6 times   Off
CH61 Cond. Pipe Sensor Temp. High High Condenser Temperature 6 times 1 time Off
CH62 Heat Sink Sensor Temp. High High Heat Sink Temperature 6 times 2 times Off
CH63 Cond. Pipe Sensor Temp. Low Low Condenser Temperature 6 times 3 times Off
CH65 Heat Sink Sensor (Open/Short) Open / Short circuit 6 times 5 times Off
CH67 Outdoor BLDC Fan Lock Fan Motor/Circuit Problem 6 times 7 times Off
CH73 PFC Fault Error (S/W) Inverter PCB input current is over 48A (Peak) for 2ms 7 times 3 times
CH83 Check Refrigerant Gas Leakage On
CH105     Communication Error           (Mainboard ↔Fan board) Poor or Loss of Communication 6 times 5 times Off

LG Room AC Error Codes

Error Codes Description Causes AC Unit Status
P2 or FL Depending on the model indicate that the drain pan in the unit is full Blockage of dirt or too much humidity On
CH34 Safety Relay Due to abnormal pressure in the sealed system Off
E1 or CH02 Auto Stop Protection Indoor Pipe Sensor Open/Short Condition Off
E2 or Ch01 Auto Stop Protection Indoor Air Sensor Open/Short Condition Off
E3 or CH03 No Refrigerant Refrigerant Leakage Off
E4 Defrosting Mode Not an Error Defrosting the ice Off
E5 Water Collection Tank Full Drain Water from the tank Off
F1 Fan Speed Not am Error On
F2 Fan Speed Not an Error On
F3 Fan Speed Level 3 Not an Error On

LG Inverter Air Conditioner Error Codes List

For Standard Wall-Mounted High-Efficiency Single Zone Systems [ Model- LS091HSV & LS121HSV ]

Error Codes Description  LED Green 
LED  Red 
1 The indoor unit return air thermistor has disconnected or has shorted out 1X
2 The indoor unit inlet pipe thermistor has disconnected or has shorted out 2X
5 Communication failure from the indoor unit to the outdoor unit 5X
6 The indoor unit inlet pipe thermistor has disconnected or has shorted out 6X
9 Indoor unit EEPROM error 9X 1X
10 The indoor unit fan has locked up (fan motor operation failure) 1X
12 The indoor unit middle pipe thermistor has disconnected or has shorted out 2X 1X
  21 DC peak error/IPM fault; compressor DC voltage was too high 2X 1X
22 Current transformer2 (CT2) error, AC input current is too high 2X  2X
23 DC link voltage is too low 2X  3X
 25  The voltage to the system is too low or too high 2X 5X
26 Inverter compressor has seized up or is not providing rotation 2X  6X
27 Prospective short circuit (PSC) fault error, current to inverter compressor between AC and DC converter circuit is too high 2X 7X
28 Inverter compressor DC voltage is too high 2X 8X
29 Inverter compressor amperage is too high 2X 9X
31 Current the current transformer (CT) thermistor is too low 3X 1X
32 Inverter compressor discharge pipe temperature is too high 3X  2X
40 The current transformer (CT) thermistor has disconnected or has shorted out 4X
41 Inverter compressor discharge pipe thermistor has disconnected or has shorted out 4X 1X
44 The outdoor unit inlet air thermistor has disconnected or has shorted out 4X 4X
45 Outdoor unit condenser coll middle thermistor has disconnected or has shorted out 5X 5X
46 The outdoor unit suction line thermistor has disconnected or has shorted out 4X 6X
48 Outdoor unit coll outlet (liquid line) thermistor has disconnected or has shorted out 4X 8X
53 Communication failure from the outdoor unit to the indoor unit  5X 3X 
60 Outdoor unit PCB EEPROM checksum error 6X
61 The outdoor unit condenser coil temperature is too high  6X  1X
62 Outdoor unit inverter compressor PCB heat sink temperature is too high  6X 2X
63 Condenser coil pipe thermistor temperature is too low 6X 3x
65 The heat sink thermistor has disconnected or has shorted out 6X 5X
67 Outdoor BLDC fan motor lock error 6X 7X

 

 

LG AC Error Codes Troubleshooting Guide.

How to Fix 01 Error in LG AC?

The meaning of the 01 error is the Indoor unit return air Thermistor is faulty. You can try to Unplug the Thermistor from the PCB & Check the resistance value for 20k ohms.

Alternatively, you can test the sensor while still connected to the PCB board. You have to measure the DC voltage across the resistor and check it for 5 volts DC.

 

How to Fix 02 Error in LG AC?

The meaning of the 02 error is that there is a problem with the Indoor unit coil inlet Thermistor. You can unplug the Thermistor from the indoor PCB and Check it for 20k ohms resistance.

You also can check the sensor while still connected to the PCB. Simply measure the DC voltage across the resistor and check it for 5 volts DC.

 

How to Fix 03 Error in LG AC?

The meaning of 03 error indicates a wiring error between the remote control system 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. Check first if you did the wiring correctly.

Now you can check the switch on the backside of the remote controller. Make sure it is 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 problem is still the same, you can 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 the signal (Comms.)
Test
The voltage across the Brown/ Black cable and the Red should be 12 Vdc
Voltage from Yellow to Brown/Black should fluctuate between 8 – 12 Vdc.

 

How to Fix 04 Error in LG AC?

04 error code indicates that the fan coil’s float switch has risen. Without a drain pump On the fan coils, it indicates that the jumper (a 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 remove this fault code.

 

How to Fix 05 Error in LG AC?

05 error code indicates a communication problem between the indoor and outdoor units. It appears approximately 5 minutes after powering up the system.
The communication between the units is a fluctuating DC voltage commonly called a serial signal.  If there is a communication error fault CH05 will appear on the Wired Remote within 5 mins of powering up the system. It can be easily lost if the wiring is not done correctly.

 

How to Fix 06 Error in LG AC?

The meaning of the 06 error code is the problem with the Indoor unit coil outlet Sensor. You can unplug the sensor from the indoor PCB and Check its resistance for 20k ohms.

You also can test the sensor while it is still connected to the PCB to measure the DC voltage across the resistor and check it for 5 DC Volts.

 

How to Fix 07 Error in LG AC?

A CH07 error code will appear when the condenser is in heating and any slave is set on cool mode. Likewise, if the condenser is in cooling and any slave is set to heating a CH07 fault code will appear.

If the master is switched off the next longest running unit becomes the master. To clear the fault turn off the unit at the remote controller, turn it back on again and change the mode.

 

How to Fix 09 Error in LG AC?

If you facing a 09 error problem in your air conditioner, you can check for loose connections or dry joints where EEPROM connects on Main PCB. You need to repair it if possible, if you can not repair then you can replace the PCB.

 

How to Fix 10 Error Code in LG AC?

Appearing a 10 error code in the display can cause of a faulty indoor fan motor. You can check if the fan motor lock or faulty. Replace the fan motor. If the problem is still the same, change the PCB.

 

How to Fix 21 Error Code In LG AC?

The meaning of the 21 error code is overcurrent in the DC power circuit of an inverter ac unit. When the DC part of the circuit exceeds 14 Amps, 21 error codes will be displayed.

 

how to fix the 22 Error Code in LG AC?

When the compressor is over-current, the 22 error code will appear in the display.  You can check the PCB using a multimeter, check all connectors for loose connections and check the main power circuit voltage.

 

Watch the video:-

 

 

Read More-

How to Fix CH Error In LG Air Conditioner 

LG AC CH02 Error Code Troubleshooting

CH01 Error Code LG Air Conditioner 

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