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LG Multi V 5 Commercial VRF Aircon CH145 Error Code

Capture the LG Multi V 5 commercial VRF CH145 fault correctly, then see what should be checked before parts are quoted. Read the final display digit: 1 identifies the master, 2 slave 1, and 3 slave 2.

What does LG CH145 mean?

LG Multi V 5 commercial VRF CH145 is listed as master outdoor unit: Communication error between the outdoor main board and external board, slave 1 outdoor unit: Communication error between the outdoor main board and external board, and slave 2 outdoor unit: Communication error between the outdoor main board and external board in VRF, Cassette, Ducted rows such as LG Multi V 5 commercial VRF. This meaning comes from the manufacturer's own diagnostic material. Use the complete display code and its final digit - 1 for master, 2 for slave 1, or 3 for slave 2 - to choose the reporting outdoor frame before parts are quoted. Confirm the complete display code and whether its final digit identifies the master, slave 1, or slave 2 outdoor frame before accepting a parts quote.

What to do now

Use these steps before customer action, a signal-wire check, or PCB quote.

  • Treat it as a fault signal

    If CH145 remains displayed or cooling is still abnormal, preserve the code and arrange diagnosis.

  • No manufacturer reset steps listed for CH145

    Capture the complete CH145 display and model stickers first. The manufacturer lists no customer reset procedure; do not treat a generic power-cycle as manufacturer guidance.

  • Send these to us

    CH145 error code, a clear display photo, LG Multi V 5 commercial VRF model stickers, affected rooms, operating state when the code appeared, and whether one room or every room failed

Choose the listing that matches your unit

The same code has more than one listed meaning. Match the model family, the system type and the unit that shows the code before approving parts.

  • Code
    1451
    What it means
    master outdoor unit: Communication error between the outdoor main board and external board
    What to check first
    Use the complete 1451 display shown by the master outdoor unit.
  • Code
    1452
    What it means
    slave 1 outdoor unit: Communication error between the outdoor main board and external board
    What to check first
    Use the complete 1452 display shown by the slave 1 outdoor unit.
  • Code
    1453
    What it means
    slave 2 outdoor unit: Communication error between the outdoor main board and external board
    What to check first
    Use the complete 1453 display shown by the slave 2 outdoor unit.

Guidance for your model

Notes that match the code to your exact model. Electrical, refrigerant, wiring, resistance and component checks are for a technician.

  • Detail
    Diagnostic note
    What it says
    Record 1451 and confirm that the master outdoor unit reported it. Have the technician trace the applicable communication wiring, plugs, addressing, and board communication path before replacing PCBs.
  • Detail
    Diagnostic note
    What it says
    Record 1452 and confirm that the slave 1 outdoor unit reported it. Have the technician trace the applicable communication wiring, plugs, addressing, and board communication path before replacing PCBs.
  • Detail
    Diagnostic note
    What it says
    Record 1453 and confirm that the slave 2 outdoor unit reported it. Have the technician trace the applicable communication wiring, plugs, addressing, and board communication path before replacing PCBs.
  • Detail
    Singapore / model note
    What it says
    LG Singapore lists Multi V 5, but the installed unit nameplate and matching service manual control. Do not apply this row to Multi V i or another LG family.

What to check before repair

Use this split to separate safe evidence capture from the tests a technician should prove before quoting parts.

  • You can check
    Before taking any system action on CH145, take a clear display photo.
    Technician should confirm
    Match CH145 against your model family's listing before parts are quoted.
  • You can check
    Capture the LG Multi V 5 commercial VRF indoor and outdoor model stickers so the correct family row is used.
    Technician should confirm
    Test communication terminals, cable continuity, polarity, and outdoor power.
  • You can check
    The manufacturer lists no customer reset procedure for this code. Note whether one room, several rooms, or the whole system is affected.
    Technician should confirm
    Read indoor and outdoor PCB indicators only after the signal path is proven sound.

Wiring or PCB decision

LG Multi V 5 commercial VRF CH145 should start with terminal, signal-cable, and power checks. PCB replacement only makes sense after the communication path is proven sound.

  • A loose terminal or bad junction is a targeted repair once the path is confirmed.

  • Signal-wire replacement depends mostly on access through trunking, ceiling, or concealed routes.

  • PCB cost should be weighed against age only after wiring and power checks pass.

LG CH145 questions

What does the LG CH145 error mean?
LG Multi V 5 commercial VRF CH145 is listed as master outdoor unit: Communication error between the outdoor main board and external board, slave 1 outdoor unit: Communication error between the outdoor main board and external board, and slave 2 outdoor unit: Communication error between the outdoor main board and external board in VRF, Cassette, Ducted rows such as LG Multi V 5 commercial VRF. This meaning comes from the manufacturer's own diagnostic material. Use the complete display code and its final digit - 1 for master, 2 for slave 1, or 3 for slave 2 - to choose the reporting outdoor frame before parts are quoted. Confirm the complete display code and whether its final digit identifies the master, slave 1, or slave 2 outdoor frame before accepting a parts quote.
Can I fix a LG CH145 error myself?
No. CH145 needs a technician's measurement before parts are decided. Before taking any system action on CH145, take a clear display photo. Capture the LG Multi V 5 commercial VRF indoor and outdoor model stickers so the correct family row is used.
Is it safe to keep running the aircon with a CH145 error?
If CH145 remains displayed or cooling is still abnormal, preserve the code and arrange diagnosis.
What causes a LG CH145 error?
LG CH145 has a listed meaning that depends on the exact model and on which unit shows the code. Use the decoder on this page before assuming a specific cause.
Will a LG CH145 error need a repair or a full replacement?
LG Multi V 5 commercial VRF CH145 should start with terminal, signal-cable, and power checks. PCB replacement only makes sense after the communication path is proven sound.
What should I send a technician about a LG CH145 error?
Before booking, send: CH145 error code, a clear display photo, LG Multi V 5 commercial VRF model stickers, affected rooms, operating state when the code appeared, and whether one room or every room failed.

Where to go next

Confirm the fault

Share the error code, model number and symptoms so we can assess the likely cause.