LG AIR CONDITIONER ERROR CODES

LG AIR CONDITIONER 

ERROR CODES FOR INDOOR AND OUTDOOR UNITS

MODELS 
Standard Wall-Mounted High-Efficiency Single Zone Systems


LS091HSV System (LSN091HSV Indoor Units / LSU091HSV Outdoor Units)

LS121HSV System (LSN121HSV Indoor Units / LSU121HSV Outdoor Units)



LSN091HSV and LSN121HSV Indoor Units ERRORS
Location of LEDs


LED1 HEATING AND LED 2 COOLING
ERROR CODE 1: Indoor unit return air thermistor has disconnected or has shorted out.
LED1 - 1X , LED2 - NIL

ERROR CODE 2: Indoor unit inlet pipe thermistor has disconnected or has shorted out.
LED1 - 2X, LED2 - NIL
ERROR CODE  5 : Communication failure from indoor unit to outdoor unit.
LED1 - 5X, LED2 - NIL
ERROR CODE 6: Indoor unit outlet pipe thermistor has disconnected or has shorted out.
LED1 - 6X, LED2 - NIL
ERROR CODE 9: Indoor unit EEPROM error.
LED1 - 9X, LED2 - NIL
ERROR CODE 10: Indoor unit fan has locked up (fan motor operation failure).
LED1 - NIL, LED2 – 1X
ERROR CODE 12: Indoor unit middle pipe thermistor has disconnected or has shorted out.
LED1 - 2X, LED2 – 1X
ERROR CODE 21: DC peak error / IPM fault; compressor DC voltage was too high.
LED1 - 2X, LED2 – 1X
ERROR CODE 22: Current transformer2 (CT2) error; AC input current is too high.
LED1 - 2X, LED2 – 2X
ERROR CODE 23: DC link voltage is too low.
LED1 - 2X, LED2 – 3X
ERROR CODE 25: Voltage to the system is too low or too high.
LED1 - 2X, LED2 – 5X
ERROR CODE 26: Inverter compressor has seized up or is not providing rotation.
LED1 - 2X, LED2 – 6X
ERROR CODE 27: Prospective short circuit (PSC) fault error; current to inverter compressor between AC and DC converter circuit is too high.
LED1 - 2X, LED2 – 7X
ERROR CODE 28: Inverter compressor DC voltage is too high.
LED1 - 2X, LED2 – 8X
ERROR CODE 29: Inverter compressor amperage is too high.
LED1 - 2X, LED2 – 9X
ERROR CODE 31: Current to the current transformer (CT) thermistor is too low.
LED1 -- 3X, LED2 – 1X
ERROR CODE 32: Inverter compressor discharge pipe temperature is too high.
LED1 -- 3X, LED2 – 2X
ERROR CODE 40: Current transformer (CT) thermistor has disconnected or has shorted out.
LED1 - 4X, LED2 – NIL
ERROR CODE 41: Inverter compressor discharge pipe thermistor has disconnected or has shorted out.
LED1 -- 4X, LED2 – 1X
ERROR CODE 44: Outdoor unit inlet air thermistor has disconnected or has shorted out.
LED1 -- 4X, LED2 – 4X
ERROR CODE 45: Outdoor unit condenser coil middle thermistor has disconnected or has shorted out.
LED1 - 4X, LED2 – 5X
ERROR CODE 46: Outdoor unit suction line thermistor has disconnected or has shorted out.
LED1 - 4X, LED2 – 6X
ERROR CODE 48: Outdoor unit coil outlet (liquid line) thermistor has disconnected or has shorted out.
LED1 - 4X, LED2 – 8X
ERROR CODE 53: Communication failure from outdoor unit to indoor unit.
LED1 - 5X, LED2 – 3X
ERROR CODE 60: Outdoor unit PCB EEPROM check sum error.
LED1 - 6X, LED2 – NIL
ERROR CODE 61: Outdoor unit condenser coil temperature is too high.
LED1 - 6X, LED2 – 1X
ERROR CODE 62: Outdoor unit inverter compressor PCB heat sink temperature is too high.
LED1 - 6X, LED2 – 2X
ERROR CODE 63: Condenser coil pipe thermistor temperature is too low.
LED1 - 6X, LED2 – 3X
ERROR CODE 65: Heat sink thermistor has disconnected or has shorted out.
LED1 - 6X, LED2 – 5X
ERROR CODE 67: Outdoor BLDC fan motor lock error.
LED1 - 6X, LED2 – 7X

LSU091HSV and LSU121HSV Outdoor Units ERRORS
Location of PCB LEDs: To access outdoor unit PCB LEDs, remove top cover, and then remove lid to PCB box.
LED 1 GREEN AND LED 2 RED



ERROR CODE 1: Indoor unit return air thermistor has disconnected or has shorted out.
LED1 – 1X, LED2 – NIL
ERROR CODE 2: Indoor unit inlet pipe thermistor has disconnected or has shorted out.
LED1 - 2X, LED2 – NIL
ERROR CODE 5: Communication failure from indoor unit to outdoor unit.
LED1 - 5X, LED2 – NIL
ERROR CODE 6: Indoor unit outlet pipe thermistor has disconnected or has shorted out.
LED1 - 6X, LED2 – NIL
ERROR CODE 9: Indoor unit EEPROM error.
LED1 - 9X, LED2 – NIL
ERROR CODE 10: Indoor unit fan has locked up (fan motor operation failure).
LED1 - NIL, LED2 – 1X
ERROR CODE 12: Indoor unit middle pipe thermistor has disconnected or has shorted out.
LED1 - 2X, LED2 – 1X
ERROR CODE 21: DC peak error / IPM fault; compressor DC voltage was too high.
LED1 - 2X, LED2 – 1X
ERROR CODE 22: Current transformer2 (CT2) error; AC input current is too high.
LED1 - 2X, LED2 – 2X
ERROR CODE 23: DC link voltage is too low.
LED1 - 2X, LED2 – 3X
ERROR CODE 25: Voltage to the system is too low or too high.
LED1 - 2X, LED2 – 5X

ERROR CODE 26: Inverter compressor has seized up or is not providing rotation.
LED1 - 2X, LED2 – 6X
ERROR CODE 27: Prospective short circuit (PSC) fault error; current to inverter compressor between AC and DC converter circuit is too high.
LED1 - 2X, LED2 – 7X

ERROR CODE 28: Inverter compressor DC voltage is too high.
LED1 - 2X, LED2 – 8X
ERROR CODE 29: Inverter compressor amperage is too high.
LED1 - 2X, LED2 – 9X
ERROR CODE 31: Current to the current transformer (CT) thermistor is too low.
LED1 - 3X, LED2 – 1X
ERROR CODE 32: Inverter compressor discharge pipe temperature is too high.
LED1 - 3X, LED2 – 2X
ERROR CODE 40: Current transformer (CT) thermistor has disconnected or has shorted out.
LED1 - 4X, LED2 – NIL
ERROR CODE 41: Inverter compressor discharge pipe thermistor has disconnected or has shorted out.
LED1 - 4X, LED2 – 1X
ERROR CODE 44: Outdoor unit inlet air thermistor has disconnected or has shorted out.
LED1 - 4X, LED2 – 4X
ERROR CODE 45: Outdoor unit condenser coil middle thermistor has disconnected or has shorted out.
LED1 - 4X, LED2 – 5X
ERROR CODE 46: Outdoor unit suction line thermistor has disconnected or has shorted out.
 LED1 - 4X, LED2 – 6X
ERROR CODE 48: Outdoor unit coil outlet (liquid line) thermistor has disconnected or has shorted out.
LED1 - 4X, LED2 – 8X
ERROR CODE 53: Communication failure from outdoor unit to indoor unit.
LED1 - 5X, LED2 – 3X
ERROR CODE 60: Outdoor unit PCB EEPROM check sum error.
LED1 - 6X, LED2 – NIL
ERROR CODE 61: Outdoor unit condenser coil temperature is too high.
LED1 - 6X, LED2 – 1X
ERROR CODE 62: Outdoor unit inverter compressor PCB heat sink temperature is too high.
LED1 - 6X, LED2 – 2X
ERROR CODE 63: Condenser coil pipe thermistor temperature is too low.
LED1 - 6X, LED2 – 3X
ERROR CODE 65: Heat sink thermistor has disconnected or has shorted out.
LED1 - 6X, LED2 – 5X
ERROR CODE 67: Outdoor BLDC fan motor lock error.
LED1 - 6X, LED2 – 7X