Model reference

LG ARUB80LT2

Name: LG ARUB80LT2
Brand: LG

Heat Pump

1 document66 error codes16 service modes

Available documentation

Service Manual

Heat Recovery Outdoor Unit R410A SERVICE MANUAL (Exploded View)31 pg
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01 on my LG ARUB80LT2

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Indoor unit air temperature sensor is

From Service Manual 624143, p.35:

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 (66)

CodeMeaning

01Indoor unit air temperature sensor is open or short.02Indoor unit inlet pipe temperature sensor is open or short.03Transmission error between wired remote controller and indoor unit 04Drain pump malfunction 05Transmission error between outdoor unit and indoor unit 06Indoor unit outlet pipe temperature sensor is open or short.07Different operation mode 09Indoor unit EEPROM error 10Indoor unit BLDC fan motor failure 104Communication error between outdoor units 105Transmission error between fan PCB and main PCB 106Outdoor unit fan PCB IPM failure 107Fan DC link low voltage error 11Indoor unit transmission error 113Outdoor unit liquid pipe (condenser) temperature sensor error 114Outdoor unit sub-cooling inlet/outlet temperature sensor error 115Outdoor unit subcooling outlet temperature sensor error 151Function error of 4-way (reversing) valve in outdoor unit 173Constant speed compressor fault 193Fan PCB heatsink temperature high 194Fan PCB heatsink temperature sensor error 200Pipe detection error 201HR unit liquid pipe temperature sensor error 202HR unit sub-cooling inlet pipe temperature sensor error 203HR unit sub-cooling outlet pipe temperature sensor error 204Transmission error between HR unit and outdoor unit 21Inverter compressor IPM fault 22Inverter PCB assembly AC input current over error 23Inverter compressor DC link low voltage 24High pressure switch

View all 66 error codes

25Input voltage high/low 26Inverter compressor start failure 28Inverter DC link high voltage error 29Inverter compressor over current 32Over-increase of discharge temperature of inverter compressor 33Over-increase of discharge temperature of constant speed compressor 34Over-increase of discharge pressure of compressor 35Excessive drop of discharge pressure of compressor 40Inverter compressor CT sensor fault 41Inverter compressor discharge pipe temperature sensor fault 42Low pressure sensor error 43High pressure sensor error 44Outdoor unit air temperature sensor fault 45Heat exchanger temperature sensor (A) fault in outdoor unit 46Outdoor unit compressor suction temperature sensor fault 47Constant speed compressor discharge pipe temperature sensor fault 48Heat exchanger temperature sensor (B) fault in outdoor unit 50Outdoor unit 3-phase power omission error 51Over-capacity 52Transmission error from inverter PCB to main PCB 53Transmission error from indoor unit to main PCB of outdoor unit 54Wrong connection of 3-phase power supply cable 59Slave outdoor unit mixed installation 60Inverter PCB EEPROM error 67Outdoor unit fan lock error 70Constant speed compressor CT sensor error 71Inverter input current (PFC) CT sensor error 73AC input instant over current error 743-phase power unbalance 75Fan CT sensor error 76Fan DC link high voltage error 77Fan over current error 78Fan hall sensor error 79Fan start failure error 86Main PCB EEPROM error 87Fan PCB EEPROM error

Service modes (16)

Auto Addressing (Indoor units and HR units)["Turn on HR unit, indoor unit, and outdoor unit power in that order.","Wait 3 minutes after power…
Auto Pipe Detection["Ensure indoor unit auto addressing is complete.","Turn No.1 of SW02M of HR unit PCB…
Black Box Function (Error Data Loading)["Stop indoor and outdoor units.","Press the black button for 5 seconds.","EEPROM to main micom…
Emergency Operation (Manual Back Up)["Determine which compressor is broken.","Turn off the power.","Set dip switch of defective outdoor…
Forced Defrosting["Set dip switches per defrost table setting.","Power reset."]
Forced Indoor Unit Operation (Cooling)["Set SW01B dip switches per table (cooling forced operation setting).","Power reset."]
Forced Indoor Unit Operation (Heating)["Set SW01B dip switches per table (heating forced operation setting).","Power reset."]
Forced Oil Return["Set dip switches per forced oil return table setting.","Power reset."]
Manual Pipe Detection["Enter central control address into each indoor unit using its wired remote control.","Turn No.1…
Night Silent Operation["Set dip switch No.12 and No.14 ON on master outdoor unit SW01B.","Power reset main PCB.","Set fan…
Pump Down["Close liquid SVC valve of each unit.","Close high pressure SVC valve of each unit.","Open low…
Pump Out["Close liquid SVC valve of each unit.","Close low pressure SVC valve of each unit.","Open high…
Refrigerant Auto Charging["Wait 3 minutes after power reset.","Set dip switches
Refrigerant Checking Function["Wait 3 minutes after power reset.","Set dip switches
Sensor Checking Function["Wait 3 minutes after power reset.","Set dip switches
Vacuum Mode["Reset outdoor unit power.","Set master main PCB dip switch No.11 and No.14 ON.","Press the black…

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