LG AC Error Codes List | LG AC Troubleshooting Guide
In this post, we are going to provide you complete LG AC error codes list.
Table of Contents
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.
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How to Fix CH Error In LG Air Conditioner
