Model reference

LG LRNN072SUR0

Name: LG LRNN072SUR0
Brand: LG

Air Conditioner

1 document82 error codes5 service modes

Available documentation

Service Manual

Air Conditioner Service Manual R410A340 pg
Covers this model

MyPros+ Max

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M+

M+ Max·LG Air Conditioner

01 on my LG LRNN072SUR0

M+

Indoor unit air temperature sensor open

From Service Manual 154086, p.18:

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 operated in a different operation mode from other currently…09Indoor unit EEPROM serial number error 100Discharge temperature of Sub1 outdoor unit No.1 constant speed compressor…101Discharge temperature of Sub1 outdoor unit No.2 constant speed compressor…102Discharge temperature of Sub2 outdoor unit No.1 constant speed compressor…103Discharge temperature of Sub2 outdoor unit No.2 constant speed compressor…104Communication error between outdoor units 105Communication error between main PCB and fan driving control part 106Over-current at main outdoor unit fan motor (IPM fault).107Low voltage of main outdoor unit fan motor.108Communication error of main outdoor unit fan motor 109High pressure switch of Sub1 outdoor unit tripped due to high pressure increase.110Reverse connection or disconnection of R,S,T power line of Sub1 outdoor unit.111Communication error 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

Service modes (5)

auto_addressing["Ensure all indoor and outdoor units are powered on.","Press the red button on the Main PCB for 6…
forced_operation["Press the Forced Operation Button once.","Unit determines operation mode based on room temperature
initial_setup["Step 1
test_operation_convertible["Press the forced operation switch for about 3 seconds.","Unit operates in cooling mode at high…
test_operation_wall_mounted["Open the front panel upward.","Press the power button and hold for about 3 seconds.","Unit…

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

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