LG Multi V 5 commercial VRF aircon CH105 error code
Use this LG Multi V 5 commercial VRF CH105 error code guide to capture the fault correctly and 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 CH105 mean?
LG Multi V 5 commercial VRF CH105 is listed as master outdoor unit: Communication error between the fan PCB and inverter-compressor PCB, slave 1 outdoor unit: Communication error between the fan PCB and inverter-compressor PCB, and slave 2 outdoor unit: Communication error between the fan PCB and inverter-compressor PCB in VRF, Cassette, Ducted rows such as LG Multi V 5 commercial VRF. The loaded row is source-backed by official 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.
Choose the matching source row
The same visible code has more than one source-backed meaning. Match the model family, system type, or reporting unit before approving parts.
| Code | What it means | What to check first |
|---|---|---|
| 1051 | master outdoor unit: Communication error between the fan PCB and inverter-compressor PCB | Use the complete 1051 display for the master outdoor unit source row. |
| 1052 | slave 1 outdoor unit: Communication error between the fan PCB and inverter-compressor PCB | Use the complete 1052 display for the slave 1 outdoor unit source row. |
| 1053 | slave 2 outdoor unit: Communication error between the fan PCB and inverter-compressor PCB | Use the complete 1053 display for the slave 2 outdoor unit source row. |
What to do now
Use these steps before customer action, a signal-wire check, or PCB quote.
Treat it as a fault signal
If CH105 remains displayed or cooling is still abnormal, preserve the code and arrange diagnosis.
No manufacturer reset steps listed for CH105
Capture the complete CH105 display and model stickers first. The selected source row lists no customer reset procedure; do not treat a generic power-cycle as manufacturer guidance.
Send these to us
CH105 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
Source-specific guidance
These diagnostic-reference notes help match the code to the exact model. Electrical, refrigerant, wiring, resistance, and component checks are technician work, not DIY steps.
| Source detail | What it says |
|---|---|
| Diagnostic note | Record 1051 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. |
| Diagnostic note | Record 1052 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. |
| Diagnostic note | Record 1053 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. |
| Singapore / model note | 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. Electrical limits vary by model and supply. Use the installed Singapore supply and model data rather than thresholds from another market. |
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 | Technician should confirm |
|---|---|
| Before taking any system action on CH105, take a clear display photo. | Match CH105 against the exact model-family source row before quoting parts. |
| Capture the LG Multi V 5 commercial VRF indoor and outdoor model stickers so the correct family row is used. | Test communication terminals, cable continuity, polarity, and outdoor power. |
| The selected source row lists no customer reset procedure. Note whether one room, several rooms, or the whole system is affected. | Read indoor and outdoor PCB indicators only after the signal path is proven sound. |
Wiring or PCB decision
LG Multi V 5 commercial VRF CH105 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 CH105 questions
What does the LG CH105 error mean?
Can I fix a LG CH105 error myself?
Is it safe to keep running the aircon with a CH105 error?
What causes a LG CH105 error?
Will a LG CH105 error need a repair or a full replacement?
What should I send a technician about a LG CH105 error?
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Use these if the quote mentions the parts, checks, or repair path this code points to.