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.
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.
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
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
