LG aircon error codes & blinking lights

Search any LG code or blinking light. Each row shows urgency, what to check, and whether to approve repair work.

LG error code & blinking light lookup

Search any code or blinking light to filter the list below. For the broader diagnostic walkthrough, see the LG diagnostic guide.

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LG aircon error codes & blinking lights

LG error code & blinking light lookup

CH01Indoor unit room temperature sensor error

CH02Indoor unit inlet pipe sensor error

CH03Wired remote-controller or controller communication error.

CH04Optional float switch or drain-pump error.

CH04 / FLDrainage issue or condensate tank full.

CH05Communication error between the indoor and outdoor units.

CH06Indoor unit outlet pipe sensor error

CH07Different operation mode conflict on a multi-connected system.

CH08RAC indoor unit BLDC fan problem.

CH09Indoor unit EEPROM error

CH10Indoor BLDC fan lock or indoor fan motor operation failure.

CH11Multi V indoor unit not connected to an outdoor unit.

12Indoor unit middle pipe sensor error

13RAC product = PSC (reactor) error, text 27 for help.

14RAC product = compressor phase current error.

CH21DC peak / IPM fault; compressor DC voltage was too high

CH22CT2 error; alternating current input too high

CH23DC link low voltage

CH24Splits and Multi Splits = high or low pressure trip.

CH25AC low or high voltage

CH26DC compressor position error or locking

CH27PSC fault; inverter compressor converter current too high

CH28Inverter compressor DC voltage is too high

CH29Inverter compressor amperage is too high

CH31Current-to-current transformer thermistor is too low

CH32Inverter compressor discharge pipe overheat

CH33Excessive rise of standard compressor discharge temperature.

CH35Excessive low pressure drop under 1 bar at LP sensor.

CH38Low refrigerant warning.

CH40CT sensor error; thermistor is disconnected or shorted

CH41Inverter discharge pipe sensor is disconnected or shorted

CH42Low pressure sensor fault.

CH43High pressure sensor fault.

CH44Outdoor air sensor is disconnected or shorted

CH45Middle thermistor of outdoor unit condenser coil is disconnected or shorted

CH46Outdoor unit suction line thermistor is disconnected or shorted

CH47Compressor discharge sensor fault.

CH48Outdoor unit coil outlet liquid-line thermistor is disconnected or shorted

CH49Check power supply voltage to the outdoor unit is correct: 1Ph 220 Vac +/-10% or 3Ph 380 Vac +/-10%.

CH51Unit mismatch.

CH52Communication error between inverter PCB and main outdoor unit PCB.

CH53Communication error between the indoor and outdoor units.

CH54Reverse-phase detection or phase/power issue, often after a temporary power outage or electrical work.

CH57Comms error between outdoor main PCB and inverter PCB.

CH60Outdoor unit PCB EEPROM checksum error

CH61Outdoor unit overheating during cooling or indoor unit overheating during heating.

CH62Outdoor unit inverter compressor PCB heat sink temperature is too high

63Condenser coil pipe thermistor temperature is too low

CH65Heat sink thermistor has disconnected or shorted out

CH66Communication-line or piping-connection mismatch between indoor and outdoor units.

CH67Outdoor fan error.

CH90 / CH91Test-run piping connection issue.

CH93Communication problem or outdoor-unit power issue.

CH237 / CH238Outdoor-unit power plug disconnected or aircon circuit breaker switched off.

C7Splits = compressor over current (CT2), also see code 06.

CLChild Lock display state on selected LG window air conditioners

HLCentral control is preventing local wired-remote adjustment

SP / CP / POPower Cooling, Jet Mode, or Turbo cooling display state

CH01 / heating LED 1 blinkIndoor unit return air thermistor disconnected or shorted

CH02 / heating LED 2 blinksIndoor unit inlet pipe thermistor disconnected or shorted

CH05 / heating LED 5 blinksCommunication failure from indoor unit to outdoor unit

CH06 / heating LED 6 blinksIndoor unit outlet pipe thermistor disconnected or shorted

CH09 / heating LED 9 blinksIndoor unit EEPROM error

CH10 / cooling LED 1 blinkIndoor fan motor operation failure

CH12 / heating LED 2 blinks + cooling LED 1 blinkIndoor unit middle pipe thermistor disconnected or shorted

CH21 / heating LED 2 blinks + cooling LED 1 blinkDC peak error or IPM fault; compressor DC voltage too high

CH22 / heating LED 2 blinks + cooling LED 2 blinksCurrent transformer2 error; AC input current too high

CH23 / heating LED 2 blinks + cooling LED 3 blinksDC link voltage too low

CH25 / heating LED 2 blinks + cooling LED 5 blinksSystem voltage too low or too high

CH26 / heating LED 2 blinks + cooling LED 6 blinksInverter compressor seized or not providing rotation

CH27 / heating LED 2 blinks + cooling LED 7 blinksProspective short circuit fault; inverter-compressor current too high between AC and DC converter circuit

CH28 / heating LED 2 blinks + cooling LED 8 blinksInverter compressor DC voltage too high

CH29 / heating LED 2 blinks + cooling LED 9 blinksInverter compressor amperage too high

CH31 / heating LED 3 blinks + cooling LED 1 blinkCurrent to the current-transformer thermistor too low

CH32 / heating LED 3 blinks + cooling LED 2 blinksInverter compressor discharge pipe temperature too high

CH40 / heating LED 4 blinksCurrent-transformer thermistor disconnected or shorted

CH41 / heating LED 4 blinks + cooling LED 1 blinkInverter compressor discharge pipe thermistor disconnected or shorted

CH44 / heating LED 4 blinks + cooling LED 4 blinksOutdoor unit inlet air thermistor disconnected or shorted