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Model reference

LG LMX21981ST

Refrigerator

9 documents11 error codes25 service modes

Available documentation

Tech Sheet

  • LG 4-Door Refrigerator LMX21981ST89 pg
    Covers this model

Service Manual

  • Refrigerator Service Manual52 pg
    Covers this model
  • Refrigerator Service Manual52 pg
    Covers this model
  • Refrigerator Service Manual53 pg
    Covers this model
  • Refrigerator Service Manual52 pg
    Covers this model
  • Refrigerator Service Manual52 pg
    Covers this model

Wiring Diagram

  • Fridge LMX21981ST Wiring Diagram1 pg
    Covers this model

Other

  • LG Samsung Gr L21AUSJH Astclga LG Brand LMX21981ST LMX21981ST English52 pg
    Covers this model

Installation Guide

  • LG French Door Refrigerator Owners Manual46 pg
    Covers this model
MyPros+ Max

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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 (11)

CodeMeaning
ERFan motor errorEr CFAbnormality of BLDC fan motor for mechanic (condenser) roomEr COCommunication error between MICOM of Main PCB and Display MICOM.Er dHPoor defrostingEr dSDefrosting sensor errorEr FFAbnormality of BLDC fan motor for freezerEr FSFreezer sensor errorEr IFAbnormality of BLDC fan motor for ice makingEr ISIcing sensor errorEr rSRefrigerator sensor errorEr rtRoom temperature sensor error (displayed when ICE PLUS key and Freezer Temp key…

Service modes (25)

  • Celsius / Fahrenheit TogglePress and hold the Freezer and Refrigerator pads simultaneously for 5 seconds.
  • Demo Mode1
  • Display °F/°C TogglePress and hold the FRZ TEMP and REF TEMP keys at the same time for over 5 seconds.
  • Display Power-Saving ModePress and hold the Freezer and Ice Plus pads simultaneously for 5 seconds.
  • Ice Maker Test ModePress and hold the Fill Key on the icemaker for 3 seconds.
  • Icemaker Test ModePress and hold the Fill Key on the icemaker for 3 seconds.
  • LED Check FunctionSimultaneously press the Ice Plus button and the Freezer Temperature adjustment button for one…
  • Lock ModePress and hold the LOCK button for 3 seconds.
  • RESETPush the test button one time while in TEST3 mode.
  • Room Temperature Sensor Error CheckPress ICE PLUS key and Freezer Temp key at the same time for one second.
  • Temperature Display Toggle (°F/°C)Press and hold FRZ TEMP and REF TEMP keys at the same time for over 5 seconds.
  • Test Mode (Main PCB - TEST1)Push test button one time on main PCB controller.
  • Test Mode (Main PCB - TEST1/TEST2/TEST3/RESET)["Press the test button on the main PCB controller one time to enter TEST3 (forced cooling with…
  • Test Mode (Main PCB - TEST2)Push test button one time while in TEST1 mode.
  • Test Mode (Main PCB - TEST3)Push test button one time while in TEST2 mode.
  • Test Mode (Main PCB)Press the test button on the main PCB controller once to enter TEST1
  • Test Mode RESETPush test button one time while in TEST3 mode.
  • TEST1 (Forced Cooling - Damper Open)Press test button on main PCB controller one time.
  • TEST1 (Forced Cooling)Push the test button one time on the Main PCB controller.
  • TEST2Push test button one time while in TEST1 mode.
  • TEST2 (Damper Close Test)Push test button one time while in TEST1 mode.
  • TEST2 (Damper Close)Push the test button one time while in TEST1 mode.
  • TEST2 (Forced Cooling - Damper Closed)Press test button once while in TEST1 mode.
  • TEST3 (Forced Defrost)Press test button once while in TEST2 mode.
  • TEST3 (Forced Defrosting)Push the test button one time while in TEST2 mode.

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

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