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LG Mini-Split Error Codes

LG air conditioners and heat pumps show a code such as CH05 or CH38 on the remote controller or the indoor unit display. Below are 24 LG codes across 1 model series. Each one says what it means, which series it applies to, what you can safely check, and when to call a licensed pro, with a link to the LG document it comes from.

The same code can mean different things on different series, so match the series column to your unit. Your unit's manual is the final word. Reviewed October 2026.

24 codes

LG CH01Indoor return air thermistor faultLG single-split and multi-split air conditioners (North America LED blink code chart)LG CH02Indoor inlet pipe thermistor faultLG single-split and multi-split air conditioners (North America LED blink code chart)LG CH05Indoor to outdoor communication failureLG single-split and multi-split air conditioners (North America LED blink code chart)LG CH06Indoor outlet pipe thermistor faultLG single-split and multi-split air conditioners (North America LED blink code chart)LG CH09Indoor unit EEPROM errorLG single-split and multi-split air conditioners (North America LED blink code chart)LG CH10Indoor fan locked upLG single-split and multi-split air conditioners (North America LED blink code chart)LG CH12Indoor middle pipe thermistor faultLG single-split and multi-split air conditioners (North America LED blink code chart)LG CH21DC peak error or IPM faultLG single-split and multi-split air conditioners (North America LED blink code chart)LG CH22Current transformer 2 errorLG single-split and multi-split air conditioners (North America LED blink code chart)LG CH23DC link voltage too lowLG single-split and multi-split air conditioners (North America LED blink code chart)LG CH25Supply voltage too low or too highLG single-split and multi-split air conditioners (North America LED blink code chart)LG CH26Inverter compressor seized or not rotatingLG single-split and multi-split air conditioners (North America LED blink code chart)LG CH27Inverter section overcurrent (PSC fault)LG single-split and multi-split air conditioners (North America LED blink code chart)LG CH28Compressor DC voltage too highLG single-split and multi-split air conditioners (North America LED blink code chart)LG CH29Compressor amperage too highLG single-split and multi-split air conditioners (North America LED blink code chart)LG CH32Compressor discharge temperature too highLG single-split and multi-split air conditioners (North America LED blink code chart)LG CH41Discharge pipe thermistor faultLG single-split and multi-split air conditioners (North America LED blink code chart)LG CH44Outdoor inlet air thermistor faultLG single-split and multi-split air conditioners (North America LED blink code chart)LG CH53Outdoor to indoor communication failureLG single-split and multi-split air conditioners (North America LED blink code chart)LG CH60Outdoor PCB EEPROM checksum errorLG single-split and multi-split air conditioners (North America LED blink code chart)LG CH61Outdoor condenser coil temperature too highLG single-split and multi-split air conditioners (North America LED blink code chart)LG CH62Outdoor heat sink temperature too highLG single-split and multi-split air conditioners (North America LED blink code chart)LG CH65Heat sink thermistor faultLG single-split and multi-split air conditioners (North America LED blink code chart)LG CH67Outdoor BLDC fan motor lockLG single-split and multi-split air conditioners (North America LED blink code chart)

All LG error codes

CodeMeaningApplies toSafety
CH01
On North American units, shown as blinking indicator LEDs (indoor unit, LED1 1 blink); on other markets shown as the number 1
Indoor return air thermistor faultLG single-split and multi-split air conditioners (North America LED blink code chart)🛑 Call a pro
CH02
On North American units, shown as blinking indicator LEDs (indoor unit, LED1 2 blinks); on other markets shown as the number 2
Indoor inlet pipe thermistor faultLG single-split and multi-split air conditioners (North America LED blink code chart)🛑 Call a pro
CH05
On North American units, shown as blinking indicator LEDs (indoor unit, LED1 5 blinks); on other markets shown as the number 5
Indoor to outdoor communication failureLG single-split and multi-split air conditioners (North America LED blink code chart)🧭 Check first
CH06
On North American units, shown as blinking indicator LEDs (indoor unit, LED1 6 blinks); on other markets shown as the number 6
Indoor outlet pipe thermistor faultLG single-split and multi-split air conditioners (North America LED blink code chart)🛑 Call a pro
CH09
On North American units, shown as blinking indicator LEDs (indoor unit, LED1 9 blinks); on other markets shown as the number 9
Indoor unit EEPROM errorLG single-split and multi-split air conditioners (North America LED blink code chart)🛑 Call a pro
CH10
On North American units, shown as blinking indicator LEDs (indoor unit, LED2 1 blink); on other markets shown as the number 10
Indoor fan locked upLG single-split and multi-split air conditioners (North America LED blink code chart)🧭 Check first
CH12
On North American units, shown as blinking indicator LEDs (indoor unit, LED1 2 blinks and LED2 1 blink); on other markets shown as the number 12
Indoor middle pipe thermistor faultLG single-split and multi-split air conditioners (North America LED blink code chart)🛑 Call a pro
CH21
On North American units, shown as blinking indicator LEDs (LED1 2 blinks, LED2 1 blink); on other markets shown as the number 21
DC peak error or IPM faultLG single-split and multi-split air conditioners (North America LED blink code chart)🛑 Call a pro
CH22
On North American units, shown as blinking indicator LEDs (LED1 2 blinks, LED2 2 blinks); on other markets shown as the number 22
Current transformer 2 errorLG single-split and multi-split air conditioners (North America LED blink code chart)🛑 Call a pro
CH23
On North American units, shown as blinking indicator LEDs (LED1 2 blinks, LED2 3 blinks); on other markets shown as the number 23
DC link voltage too lowLG single-split and multi-split air conditioners (North America LED blink code chart)🛑 Call a pro
CH25
On North American units, shown as blinking indicator LEDs (LED1 2 blinks, LED2 5 blinks); on other markets shown as the number 25
Supply voltage too low or too highLG single-split and multi-split air conditioners (North America LED blink code chart)🛑 Call a pro
CH26
On North American units, shown as blinking indicator LEDs (LED1 2 blinks, LED2 6 blinks); on other markets shown as the number 26
Inverter compressor seized or not rotatingLG single-split and multi-split air conditioners (North America LED blink code chart)🛑 Call a pro
CH27
On North American units, shown as blinking indicator LEDs (LED1 2 blinks, LED2 7 blinks); on other markets shown as the number 27
Inverter section overcurrent (PSC fault)LG single-split and multi-split air conditioners (North America LED blink code chart)🛑 Call a pro
CH28
On North American units, shown as blinking indicator LEDs (LED1 2 blinks, LED2 8 blinks); on other markets shown as the number 28
Compressor DC voltage too highLG single-split and multi-split air conditioners (North America LED blink code chart)🛑 Call a pro
CH29
On North American units, shown as blinking indicator LEDs (LED1 2 blinks, LED2 9 blinks); on other markets shown as the number 29
Compressor amperage too highLG single-split and multi-split air conditioners (North America LED blink code chart)🛑 Call a pro
CH32
On North American units, shown as blinking indicator LEDs (LED1 3 blinks, LED2 2 blinks); on other markets shown as the number 32
Compressor discharge temperature too highLG single-split and multi-split air conditioners (North America LED blink code chart)🛑 Call a pro
CH41
On North American units, shown as blinking indicator LEDs (LED1 4 blinks, LED2 1 blink); on other markets shown as the number 41
Discharge pipe thermistor faultLG single-split and multi-split air conditioners (North America LED blink code chart)🛑 Call a pro
CH44
On North American units, shown as blinking indicator LEDs (LED1 4 blinks, LED2 4 blinks); on other markets shown as the number 44
Outdoor inlet air thermistor faultLG single-split and multi-split air conditioners (North America LED blink code chart)🛑 Call a pro
CH53
On North American units, shown as blinking indicator LEDs (LED1 5 blinks, LED2 3 blinks); on other markets shown as the number 53
Outdoor to indoor communication failureLG single-split and multi-split air conditioners (North America LED blink code chart)🧭 Check first
CH60
On North American units, shown as blinking indicator LEDs (LED1 6 blinks); on other markets shown as the number 60
Outdoor PCB EEPROM checksum errorLG single-split and multi-split air conditioners (North America LED blink code chart)🛑 Call a pro
CH61
On North American units, shown as blinking indicator LEDs (LED1 6 blinks, LED2 1 blink); on other markets shown as the number 61
Outdoor condenser coil temperature too highLG single-split and multi-split air conditioners (North America LED blink code chart)🧭 Check first
CH62
On North American units, shown as blinking indicator LEDs (LED1 6 blinks, LED2 2 blinks); on other markets shown as the number 62
Outdoor heat sink temperature too highLG single-split and multi-split air conditioners (North America LED blink code chart)🧭 Check first
CH65
On North American units, shown as blinking indicator LEDs (LED1 6 blinks, LED2 5 blinks); on other markets shown as the number 65
Heat sink thermistor faultLG single-split and multi-split air conditioners (North America LED blink code chart)🛑 Call a pro
CH67
On North American units, shown as blinking indicator LEDs (LED1 6 blinks, LED2 7 blinks); on other markets shown as the number 67
Outdoor BLDC fan motor lockLG single-split and multi-split air conditioners (North America LED blink code chart)🧭 Check first

✅ Usually fine to keep running · 🧭 Check a few things first · 🛑 Turn it off and call a licensed pro

Find your LG model series

The codes LG documents for each series we have checked. If your series is not listed, the code may mean something different on your unit, so check its manual.

LG single-split and multi-split air conditioners (North America LED blink code chart)

More LG codes

LG CH02: Indoor inlet pipe thermistor fault

🛑 Turn it off and call a licensed pro

Applies to: LG single-split and multi-split air conditioners (North America LED blink code chart). Shows as: On North American units, shown as blinking indicator LEDs (indoor unit, LED1 2 blinks); on other markets shown as the number 2

The indoor unit inlet pipe thermistor has disconnected or has shorted out.

When to call a pro: A technician needs to check the sensor and its connection.

Source: LG Single / Multi-Split Air Conditioner Error Codes (LG Canada help library), Error Code Chart

LG CH06: Indoor outlet pipe thermistor fault

🛑 Turn it off and call a licensed pro

Applies to: LG single-split and multi-split air conditioners (North America LED blink code chart). Shows as: On North American units, shown as blinking indicator LEDs (indoor unit, LED1 6 blinks); on other markets shown as the number 6

The indoor unit outlet pipe thermistor has disconnected or has shorted out.

When to call a pro: A technician needs to check the sensor and its connection.

Source: LG Single / Multi-Split Air Conditioner Error Codes (LG Canada help library), Error Code Chart

LG CH09: Indoor unit EEPROM error

🛑 Turn it off and call a licensed pro

Applies to: LG single-split and multi-split air conditioners (North America LED blink code chart). Shows as: On North American units, shown as blinking indicator LEDs (indoor unit, LED1 9 blinks); on other markets shown as the number 9

The indoor unit reports an EEPROM (memory chip) error on its board.

When to call a pro: The indoor board needs checking by a service technician.

Source: LG Single / Multi-Split Air Conditioner Error Codes (LG Canada help library), Error Code Chart

LG CH12: Indoor middle pipe thermistor fault

🛑 Turn it off and call a licensed pro

Applies to: LG single-split and multi-split air conditioners (North America LED blink code chart). Shows as: On North American units, shown as blinking indicator LEDs (indoor unit, LED1 2 blinks and LED2 1 blink); on other markets shown as the number 12

The indoor unit middle pipe thermistor has disconnected or has shorted out.

When to call a pro: A technician needs to check the sensor and its connection.

Source: LG Single / Multi-Split Air Conditioner Error Codes (LG Canada help library), Error Code Chart

LG CH22: Current transformer 2 error

🛑 Turn it off and call a licensed pro

Applies to: LG single-split and multi-split air conditioners (North America LED blink code chart). Shows as: On North American units, shown as blinking indicator LEDs (LED1 2 blinks, LED2 2 blinks); on other markets shown as the number 22

Current transformer 2 (CT2) error. The AC input current is too high.

When to call a pro: Electrical faults need a licensed technician.

Source: LG Single / Multi-Split Air Conditioner Error Codes (LG Canada help library), Error Code Chart

LG CH23: DC link voltage too low

🛑 Turn it off and call a licensed pro

Applies to: LG single-split and multi-split air conditioners (North America LED blink code chart). Shows as: On North American units, shown as blinking indicator LEDs (LED1 2 blinks, LED2 3 blinks); on other markets shown as the number 23

The DC link voltage is too low.

When to call a pro: Electrical faults need a licensed technician.

Source: LG Single / Multi-Split Air Conditioner Error Codes (LG Canada help library), Error Code Chart

LG CH25: Supply voltage too low or too high

🛑 Turn it off and call a licensed pro

Applies to: LG single-split and multi-split air conditioners (North America LED blink code chart). Shows as: On North American units, shown as blinking indicator LEDs (LED1 2 blinks, LED2 5 blinks); on other markets shown as the number 25

The voltage to the system is too low or too high.

When to call a pro: Have an electrician or LG-authorized technician check the supply voltage and unit.

Source: LG Single / Multi-Split Air Conditioner Error Codes (LG Canada help library), Error Code Chart

LG CH26: Inverter compressor seized or not rotating

🛑 Turn it off and call a licensed pro

Applies to: LG single-split and multi-split air conditioners (North America LED blink code chart). Shows as: On North American units, shown as blinking indicator LEDs (LED1 2 blinks, LED2 6 blinks); on other markets shown as the number 26

The inverter compressor has seized up or is not providing rotation.

When to call a pro: A licensed technician must diagnose the compressor.

Source: LG Single / Multi-Split Air Conditioner Error Codes (LG Canada help library), Error Code Chart

LG CH27: Inverter section overcurrent (PSC fault)

🛑 Turn it off and call a licensed pro

Applies to: LG single-split and multi-split air conditioners (North America LED blink code chart). Shows as: On North American units, shown as blinking indicator LEDs (LED1 2 blinks, LED2 7 blinks); on other markets shown as the number 27

Prospective short circuit (PSC) fault. The current to the inverter compressor between the AC and DC converter circuit is too high.

When to call a pro: Electrical faults need a licensed technician.

Source: LG Single / Multi-Split Air Conditioner Error Codes (LG Canada help library), Error Code Chart

LG CH28: Compressor DC voltage too high

🛑 Turn it off and call a licensed pro

Applies to: LG single-split and multi-split air conditioners (North America LED blink code chart). Shows as: On North American units, shown as blinking indicator LEDs (LED1 2 blinks, LED2 8 blinks); on other markets shown as the number 28

The inverter compressor DC voltage is too high.

When to call a pro: Electrical faults need a licensed technician.

Source: LG Single / Multi-Split Air Conditioner Error Codes (LG Canada help library), Error Code Chart

LG CH29: Compressor amperage too high

🛑 Turn it off and call a licensed pro

Applies to: LG single-split and multi-split air conditioners (North America LED blink code chart). Shows as: On North American units, shown as blinking indicator LEDs (LED1 2 blinks, LED2 9 blinks); on other markets shown as the number 29

The inverter compressor amperage is too high.

When to call a pro: Compressor faults need a licensed technician.

Source: LG Single / Multi-Split Air Conditioner Error Codes (LG Canada help library), Error Code Chart

LG CH32: Compressor discharge temperature too high

🛑 Turn it off and call a licensed pro

Applies to: LG single-split and multi-split air conditioners (North America LED blink code chart). Shows as: On North American units, shown as blinking indicator LEDs (LED1 3 blinks, LED2 2 blinks); on other markets shown as the number 32

The inverter compressor discharge pipe temperature is too high.

When to call a pro: A licensed technician should check the system.

Source: LG Single / Multi-Split Air Conditioner Error Codes (LG Canada help library), Error Code Chart

LG CH41: Discharge pipe thermistor fault

🛑 Turn it off and call a licensed pro

Applies to: LG single-split and multi-split air conditioners (North America LED blink code chart). Shows as: On North American units, shown as blinking indicator LEDs (LED1 4 blinks, LED2 1 blink); on other markets shown as the number 41

The inverter compressor discharge pipe thermistor has disconnected or has shorted out.

When to call a pro: A technician needs to check the sensor and its connection.

Source: LG Single / Multi-Split Air Conditioner Error Codes (LG Canada help library), Error Code Chart

LG CH44: Outdoor inlet air thermistor fault

🛑 Turn it off and call a licensed pro

Applies to: LG single-split and multi-split air conditioners (North America LED blink code chart). Shows as: On North American units, shown as blinking indicator LEDs (LED1 4 blinks, LED2 4 blinks); on other markets shown as the number 44

The outdoor unit inlet air thermistor has disconnected or has shorted out.

When to call a pro: A technician needs to check the sensor and its connection.

Source: LG Single / Multi-Split Air Conditioner Error Codes (LG Canada help library), Error Code Chart

LG CH60: Outdoor PCB EEPROM checksum error

🛑 Turn it off and call a licensed pro

Applies to: LG single-split and multi-split air conditioners (North America LED blink code chart). Shows as: On North American units, shown as blinking indicator LEDs (LED1 6 blinks); on other markets shown as the number 60

The outdoor unit PCB has an EEPROM check sum error.

When to call a pro: The outdoor board needs checking by a service technician.

Source: LG Single / Multi-Split Air Conditioner Error Codes (LG Canada help library), Error Code Chart

LG CH62: Outdoor heat sink temperature too high

🧭 Check a few things first

Applies to: LG single-split and multi-split air conditioners (North America LED blink code chart). Shows as: On North American units, shown as blinking indicator LEDs (LED1 6 blinks, LED2 2 blinks); on other markets shown as the number 62

The outdoor unit inverter compressor PCB heat sink temperature is too high.

When to call a pro: If the code returns after a power reset, contact an LG-authorized HVAC technician.

Source: LG Single / Multi-Split Air Conditioner Error Codes (LG Canada help library), Error Code Chart

LG CH65: Heat sink thermistor fault

🛑 Turn it off and call a licensed pro

Applies to: LG single-split and multi-split air conditioners (North America LED blink code chart). Shows as: On North American units, shown as blinking indicator LEDs (LED1 6 blinks, LED2 5 blinks); on other markets shown as the number 65

The heat sink thermistor has disconnected or has shorted out.

When to call a pro: A technician needs to check the sensor and its connection.

Source: LG Single / Multi-Split Air Conditioner Error Codes (LG Canada help library), Error Code Chart

Safe first steps for any code

  1. Write down the exact code and how it shows (remote display or number of lamp blinks). Similar codes mean different things on different series.
  2. Turn the system off at the remote, switch off the breaker or disconnect for the unit, wait a few minutes, then turn it back on.
  3. Clean or replace the indoor unit air filters, and make sure nothing blocks the indoor or outdoor unit.
  4. Check that the condensate drain line is not blocked or kinked where you can see it.
  5. Replace the remote controller batteries if the display is dim or the unit does not respond.

🛑 Stop and call a licensed pro if

  • Any code pointing to refrigerant, the compressor, high pressure or the outdoor unit board. Refrigerant work legally needs a certified technician.
  • Burning smell, sparks, or a breaker that trips again after a reset.
  • Water leaking from the indoor unit that does not stop after the drain is clear.

Tell us the brand, model and code, and what you have already tried. Describing it is free, and a chat with a verified HVAC technician costs $1.

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Shaun Cain · Certified HVAC & Refrigeration Technician · Ask an HVAC technician

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