Model reference

LG LRNN122TCA0

Air Conditioner

1 document82 error codes7 service modes

Available documentation

Service Manual

Air Conditioner Service Manual404 pg
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MyPros+ Max

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M+ Max·LG Air Conditioner

01 on my LG LRNN122TCA0

M+

Indoor unit air temperature sensor open

From Service Manual 984194, p.46:

1.Access service mode to confirm the active fault code and read stored error history.

2.Disconnect the sensor and measure resistance. Expected: 10 kΩ to 12 kΩ at 77°F (25°C).

3.Check the sensor harness for opens. A reading outside 5 kΩ to 50 kΩ indicates a failed sensor.

Part 6322FR2046G

Temperature thermistor

Error codes (82)

CodeMeaning

01Indoor unit air temperature sensor open or short circuit.02Indoor unit inlet pipe temperature sensor open or short circuit.03Communication error between wired remote controller and indoor unit 04Drain pump malfunction 05Communication error between outdoor unit and indoor unit 06Indoor unit outlet pipe temperature sensor open or short circuit.07Indoor unit is operating in a different mode than the other currently operating…09Indoor unit EEPROM serial number error 100Discharge temperature of Sub1 outdoor unit constant speed compressor 1 too high.101Discharge temperature of Sub1 outdoor unit constant speed compressor 2 too high.102Discharge temperature of Sub2 outdoor unit constant speed compressor 1 too high…103Discharge temperature of Sub2 outdoor unit constant speed compressor 2 too high…104Transmission error between outdoor units 105Transmission error from main outdoor unit fan driving control part.106Over-current at main outdoor unit fan motor (IPM Fault).107Low voltage of main outdoor unit fan motor.108Transmission error of main outdoor unit fan motor 109High pressure switch of Sub1 outdoor unit activated.110Reverse connection or disconnection of the R,S,T power line of Sub1 outdoor…111Transmission error between outdoor units 113Main outdoor unit liquid pipe temperature sensor open or short.114Main outdoor unit excessive cooling inlet temperature sensor open or short.115Main outdoor unit excessive cooling outlet temperature sensor open or short.116Sub1 outdoor unit high pressure sensor open or short.117Sub1 outdoor unit low pressure sensor open or short.118Sub1 outdoor unit air temperature sensor open or short.120Sub1 outdoor unit suction temperature sensor open or short.121Sub1 outdoor unit constant speed compressor 1 discharge temperature sensor open…122Sub1 outdoor unit constant speed compressor 2 discharge temperature sensor open…123Sub1 outdoor unit heat exchanger sensor (front side) open or short.

View all 82 error codes

124Sub1 outdoor unit heat exchanger sensor (rear side) open or short.125Sub1 outdoor unit liquid pipe temperature sensor open or short.126Sub1 outdoor unit excessive cooling inlet temperature sensor open or short.127Sub1 outdoor unit excessive cooling outlet temperature sensor open or short.128Sub2 outdoor unit high pressure sensor open or short (3 units).129Sub2 outdoor unit low pressure sensor open or short (3 units).130Sub2 outdoor unit air temperature sensor open or short (3 units).132Sub2 outdoor unit suction temperature sensor open or short (3 units).133Sub2 outdoor unit constant speed compressor 1 discharge temperature sensor open…134Sub2 outdoor unit constant speed compressor 2 discharge temperature sensor open…135Sub2 outdoor unit heat exchanger temperature sensor (front side) open or short…136Sub2 outdoor unit heat exchanger temperature sensor (rear side) open or short…137Sub2 outdoor unit liquid pipe temperature sensor open or short (3 units).138Sub2 outdoor unit excessive cooling inlet temperature sensor open or short (3…139Sub2 outdoor unit excessive cooling outlet temperature sensor open or short (3…140Sub2 outdoor unit high pressure switch activated (3 units).141Reverse connection or disconnection of the R,S,T power line of Sub2 outdoor…142Transmission error between outdoor units 143Compressor off by excessive increase of Sub1 outdoor unit high pressure.144Compressor off by excessive reduction of Sub1 outdoor unit low pressure.145Compressor off by excessive increase of Sub2 outdoor unit high pressure (3…146Compressor off by excessive reduction of Sub2 outdoor unit low pressure (3…147Input voltage of Sub1 outdoor unit is more than 487V or less than 270V.148Outdoor voltage sensor of Sub1 outdoor unit open or short.149Input voltage of Sub2 outdoor unit is more than 487V or less than 270V (3…150Outdoor voltage sensor of Sub2 outdoor unit open or short (3 units).151Failure of operation mode conversion 21DC peak 22Excess of limited current of main outdoor unit inverter compressor.23Poor voltage charge for driving inverter compressor 24High pressure switch of main outdoor unit activated, suspending compressor.25Input voltage is out of tolerance of rating voltage (more than 487V or less…32Discharge temperature of main outdoor unit inverter compressor too high 33Discharge temperature of main outdoor unit constant speed compressor too high 34High pressure of main outdoor unit 35Low pressure of main outdoor unit 40Current detect (CT) sensor of main outdoor unit inverter compressor open or…41Discharge temperature sensor of main outdoor unit inverter compressor open or…42Outdoor low pressure sensor of main outdoor unit open or short.43Outdoor high pressure sensor of main outdoor unit open or short.44Outdoor air sensor of main outdoor unit open or short.45Heat exchanger sensor of main outdoor unit (front side) open or short.46Suction temperature sensor of main outdoor unit open or short.47Discharge temperature sensor of the constant speed compressor of main outdoor…48Heat exchanger sensor of main outdoor unit (rear side) open or short.51Excessive connection of indoor units compared to capacity of outdoor unit.52Communication error from inverter control part to main outdoor unit control…53Communication error from indoor unit to main outdoor unit control part.54Reverse connection or disconnection of the R,S,T power line of main outdoor…57Transmission error from main control part to inverter control part.62Excessive temperature of inverter control part radiation panel (heatsink).65Fan temperature sensor open or short.

Service modes (7)

auto_addressing["Ensure all indoor and outdoor units are powered on and communication is established.","Press the…
forced_operation_convertible["Press the Forced Operation Button once.","Unit operates based on room temperature
forced_operation_wall_mounted["Press the forced operation power button.","Unit determines mode by room temperature
initial_setup["Step 1: Communication check
test_operation_art_cool_deluxe["Open the front panel upward.","Press the power button and hold it for about 3 seconds.","Unit…
test_operation_convertible["Press the forced operation switch for approximately 3 seconds.","Unit operates in cooling mode at…
test_operation_wall_mounted["Open the front panel upward.","Press the power button and hold it for about 3 seconds.","Unit…

Full entry steps, exit procedures, and test sequences are available in Max.

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