Model reference

LG LRNN072BTG0

Air Conditioner

1 document82 error codes3 service modes

Available documentation

Service Manual

Air Conditioner System SERVICE MANUAL372 pg
Covers this model

MyPros+ Max

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M+

M+ Max·LG Air Conditioner

01 on my LG LRNN072BTG0

M+

Indoor unit air temperature sensor open

From Service Manual 661835, p.47:

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 operating in a different mode from the previously operated indoor…09Indoor unit EEPROM error 100Discharge temperature of Sub1 outdoor unit No.1 constant speed compressor too…101Discharge temperature of Sub1 outdoor unit No.2 constant speed compressor too…102Discharge temperature of Sub2 outdoor unit No.1 constant speed compressor too…103Discharge temperature of Sub2 outdoor unit No.2 constant speed compressor too…104Communication error between outdoor units 105Communication error between main outdoor unit fan driving control part and main…106Occurrence of over-current at main outdoor unit fan motor (IPM fault).107Low voltage of main outdoor unit fan motor.108Communication error from main outdoor unit control part to fan driving control…109High pressure switch of Sub1 outdoor unit activated due to high pressure…110Reverse connection or disconnection of R,S,T power line of Sub1 outdoor unit.111Communication 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 compressor1 discharge temperature sensor open…122Sub1 outdoor unit constant speed compressor2 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 compressor1 discharge temperature sensor open…134Sub2 outdoor unit constant speed compressor2 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 R,S,T power line of Sub2 outdoor unit.142Communication error between outdoor units 143High pressure of Sub1 outdoor unit 144Low pressure of Sub1 outdoor unit 145High pressure of Sub2 outdoor unit 146Low pressure of Sub2 outdoor unit 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 error 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 out of tolerance 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 constant speed compressor of main outdoor unit…48Heat exchanger sensor of main outdoor unit (rear side) open or short.51Excessive indoor unit capacity connected compared to rated capacity of outdoor…52Communication error between inverter PCB and main outdoor unit control part.53Communication error between indoor unit and main outdoor unit control part.54Reverse connection or disconnection of R,S,T power line of main outdoor unit.57Transmission related 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 (3)

auto_addressing["Ensure power is connected to all indoor and outdoor units.","Press and hold the red button on the…
forced_operation["Press the forced operation button once."]
test_operation["Open the front panel upward.","Press and hold the forced operation (power) button for…

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

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