Model reference

LG A3UW186FA1

Air Conditioner

1 document30 error codes9 service modes

Available documentation

Service Manual

Multi Type Air Conditioner SERVICE MANUAL244 pg
Covers this model

MyPros+ Max

Diagnose your LG A3UW186FA1.

Step-by-step diagnostics from the service manual
Test values, resistance specs, and wiring references
Verified part numbers when replacement is needed

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Error codes (30)

CodeMeaning

01Indoor air sensor (room thermistor) open or short circuit.02Indoor inlet pipe sensor open or short circuit.03Communication error between indoor unit and wired remote controller.04Drain pump or float switch error (float switch open).05Communication error between indoor and outdoor units.06Indoor outlet pipe sensor open or short circuit.07Different operation mode error (conflicting modes between indoor units).21IPM fault / DC peak 22CT 2 (Max current)23DC link low voltage 24Low/High pressure switch open.25Abnormal AC input voltage (below 140Vac or above 300Vac).26DC compressor position detect error.27PSC fault error 28DC link high voltage 32Inverter compressor discharge pipe temperature high (above 105°C).33Constant compressor discharge pipe temperature high (above 105°C).40CT sensor circuit malfunction (open/short).41Inverter discharge pipe thermistor error (open/short).44Outdoor air thermistor error (open/short).45Condenser pipe thermistor error (open/short).46Suction pipe thermistor error (open/short).47Constant compressor discharge pipe thermistor error (open/short).51Over capacity 53Signal/communication error between indoor and outdoor units.60EEPROM check sum error 61Condenser pipe sensor temperature high (above 65°C).62Heat sink sensor temperature high (above 85°C).63Condenser pipe temperature low.65Heat sink thermistor error (open/short).

Service modes (9)

Address Monitoring Mode (Wireless Remote)Press Chaos Swing (6) and Reset (13) keys simultaneously.
Address Setting Mode (Wired Remote)Press Program (13) and Set/Clear (16) keys simultaneously for more than 3 seconds
Address Setting Mode (Wireless Remote)Press Jet Cool (5) and Reset (13) keys simultaneously for more than 3 seconds
ESP Setting Mode (Duct/Cassette Wired Remote)1
Forced Operation (Cassette Type)Press the button for 2 seconds to start forced operation.
Forced Operation (Slide Switch)Set the slide switch to the forced operation position while power is on, or supply power while…
Test Run (Cassette Type)Press the button for 5 seconds to start test run.
Test Run (Cassette Wired Remote)Press the room temperature checking button and down timer button simultaneously for 3 seconds.
Test Run (Room Type)Press the timer cancel button five times continuously.

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

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