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Model reference

LG A4UW306FA0

Air Conditioner

5 documents30 error codes25 service modes

Available documentation

Service Manual

  • Multi Type Air Conditioner SERVICE MANUAL228 pg
    Covers this model
  • Multi Type Air Conditioner SERVICE MANUAL236 pg
    Covers this model
  • Multi Type Air Conditioner SERVICE MANUAL240 pg
    Covers this model
  • Multi Type Air Conditioner SERVICE MANUAL238 pg
    Covers this model
  • Multi Type Air Conditioner SERVICE MANUAL244 pg
    Covers this model
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  • Step-by-step diagnostics from the service manual
  • Test values, resistance specs, and wiring references
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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 peak22CT 2 (Max current)23DC link low voltage24Low/High pressure switch open.25Abnormal AC input voltage (below 140Vac or above 300Vac).26DC compressor position detect error.27PSC fault error28DC link high voltage32Inverter 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 capacity53Signal/communication error between indoor and outdoor units.60EEPROM check sum error61Condenser 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 (25)

  • Address Monitoring (Wireless Remote)Press Chaos Swing (6) and Reset (13) keys simultaneously.
  • 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
  • address_monitoring_wirelessPress Chaos Swing (6) and Reset (13) keys simultaneously on wireless remote controller.
  • address_setting_wiredPress Program (13) and Set/Clear (16) keys simultaneously for more than 3 seconds on the wired…
  • address_setting_wirelessPress Jet Cool (5) and Reset (13) keys simultaneously for more than 3 seconds on wireless remote…
  • E.S.P. (External Static Pressure) Setting1
  • ESP (External Static Pressure) Setting1
  • ESP Setting Mode (Duct Type Wired Remote)1
  • ESP Setting Mode (Duct/Cassette Wired Remote)1
  • esp_setting_duct1) Push On/Off button to start unit
  • Forced OperationUse the slide switch on the indoor unit main body
  • 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…
  • Forced Operation (Split Type via Slide Switch)Set the slide switch to the forced operation position while power is on, or supply power with…
  • forced_operation_cassettePress the forced operation button for 2 seconds on the cassette indoor unit.
  • forced_operation_slide_switchSet the slide switch on the main unit to the forced operation position while power is on, or power…
  • 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 (CST 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.
  • test_run_cassettePress the forced operation button for 5 seconds on the cassette type indoor unit.
  • test_run_cassette_wired_remoconPress the room temperature checking button and down timer button simultaneously for 3 seconds on…
  • test_run_room_typePress the Timer Cancel button five times continuously on the remote controller.

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

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