DEFINING COMMON ERROR CODES - lghvac.com

1 1 DEFINING Commom ERROR CodesStandard Wall-Mounted High-Efficiency Single Zone Systems LS091 HSV System (LSN091 HSV indoor Units / LSU091 HSV outdoor Units)LS121 HSV System (LSN121 HSV indoor Units / LSU121 HSV outdoor Units) DEFINING COMMON ERROR CODESLSN091 HSV and LSN121 HSV indoor UnitsError CodeDescriptionNo. of Times indoor unit LEDs BlinkLED1 (Heating LED)LED2 (Cooling LED)1 indoor unit return air thermistor has disconnected or has shorted 2 indoor unit inlet pipe thermistor has disconnected or has shorted 5 Communication failure from indoor unit to outdoor 6 indoor unit outlet pipe thermistor has disconnected or has shorted 9 indoor unit EEPROM 10 indoor unit fan has locked up (fan motor operation failure).

2 1X12 indoor unit middle pipe thermistor has disconnected or has shorted peak ERROR / IPM fault; compressor DC voltage was too high. 2X1X22 Current transformer2 (CT2) ERROR ; AC input current is too DC link voltage is too Voltage to the system is too low or too 5X26 Inverter compressor has seized up or is not providing rotation. 2X 6X27 Prospective short circuit (PSC) fault ERROR ; current to inverter compressor between AC and DC converter circuit is too Inverter compressor DC voltage is too compressor amperage is too to the current transformer (CT) thermistor is too compressor discharge pipe temperature is too transformer (CT)

3 Thermistor has disconnected or has shorted 41 Inverter compressor discharge pipe thermistor has disconnected or has shorted outdoor unit inlet air thermistor has disconnected or has shorted outdoor unit condenser coil middle thermistor has disconnected or has shorted unit suction line thermistor has disconnected or has shorted outdoor unit coil outlet (liquid line) thermistor has disconnected or has shorted Communication failure from outdoor unit to indoor unit . 5X3X60 outdoor unit PCB EEPROM check sum 61 outdoor unit condenser coil temperature is too outdoor unit inverter compressor PCB heat sink temperature is too Condenser coil pipe thermistor temperature is too low.

4 6X 3X65 Heat sink thermistor has disconnected or has shorted out. 6X5X67 outdoor BLDC fan motor lock of LEDsRefer to Service Manuals posted on to troubleshoot ERROR COMMON ERROR CodesLED1 LED2 LSU091 HSV and LSU121 HSV outdoor UnitsStandard Wall-Mounted High-Efficiency Single Zone Systems LS091 HSV System (LSN091 HSV indoor Units / LSU091 HSV outdoor Units)LS121 HSV System (LSN121 HSV indoor Units / LSU121 HSV outdoor Units) DEFINING COMMON ERROR CODESE rror CodeDescriptionNo. of Times outdoor unit PCB LEDs BlinkLED1 (Green)LED2 (Red)21DC peak ERROR / IPM fault; compressor DC voltage was too high. 2X 1X22 Current transformer2 (CT2) ERROR ; AC input current is too DC link voltage is too Voltage to the system is too low or too compressor has seized up or is not providing rotation.

5 2X6X27 Prospective short circuit (PSC) fault ERROR ; current to inverter compressor between AC and DC converter circuit is too 7X28 Inverter compressor DC voltage is too compressor amperage is too to the current transformer (CT) thermistor is too compressor discharge pipe temperature is too transformer (CT) thermistor has disconnected or has shorted 41 Inverter compressor discharge pipe thermistor has disconnected or has shorted outdoor unit inlet air thermistor has disconnected or has shorted outdoor unit condenser coil middle thermistor has disconnected or has shorted unit suction line thermistor has disconnected or has shorted outdoor unit coil outlet (liquid line) thermistor has disconnected or has shorted Communication failure from outdoor unit to indoor unit .

6 5X3X60 outdoor unit PCB EEPROM check sum 61 outdoor unit condenser coil temperature is too outdoor unit inverter compressor PCB heat sink temperature is too Condenser coil pipe thermistor temperature is too low. 6X3X65 Heat sink thermistor has disconnected or has shorted BLDC fan motor lock of PCB LEDs: To access outdoor unit PCB LEDs, remove top cover, and then remove lid to PCB to Service Manuals posted on to troubleshoot ERROR Electronics Commercial Air Conditioning For continual product development, LG reserves the right to change specifications without Electronics , Inc., Englewood Cliffs, NJ.

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