LG Aircon CH237 / CH238 Error Code
Capture the LG CH237 / CH238 fault correctly, then see what should be checked before parts are quoted. Match the model first; same-looking codes can point to different rows.
What does LG CH237 / CH238 mean?
LG CH237 / CH238 is listed as outdoor-unit power plug disconnected or aircon circuit breaker switched off, indoor unit: Indoor-side loss of communication from the outdoor-unit PCB, and indoor unit: Indoor/outdoor PCB communication error reported at the indoor unit in Inverter Split, Multi-Split, VRF rows such as LG Multi V 5 commercial VRF. This meaning comes from the manufacturer's own diagnostic material. Do not collapse this code across model families; use the model, series, or system type to choose the right row. Confirm the exact model, series, or signal row before accepting a parts quote.
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 | What it means | What to check first |
|---|---|---|
| Inverter Split | Outdoor-unit power plug disconnected or aircon circuit breaker switched off. | Match this meaning to your installed model and the unit that shows the code, then use the checks below. |
| LG Multi V 5 commercial VRF — indoor unit: Indoor-side loss of communication from the outdoor-unit PCB | indoor unit: Indoor-side loss of communication from the outdoor-unit PCB | Match this meaning to your installed model and the unit that shows the code, then use the checks below. |
| LG Multi V 5 commercial VRF — indoor unit: Indoor/outdoor PCB communication error reported at the indoor unit | indoor unit: Indoor/outdoor PCB communication error reported at the indoor unit | Match this meaning to your installed model and the unit that shows the code, then use the checks below. |
- Code
- Inverter Split
- What it means
- Outdoor-unit power plug disconnected or aircon circuit breaker switched off.
- What to check first
- Match this meaning to your installed model and the unit that shows the code, then use the checks below.
- Code
- LG Multi V 5 commercial VRF — indoor unit: Indoor-side loss of communication from the outdoor-unit PCB
- What it means
- indoor unit: Indoor-side loss of communication from the outdoor-unit PCB
- What to check first
- Match this meaning to your installed model and the unit that shows the code, then use the checks below.
- Code
- LG Multi V 5 commercial VRF — indoor unit: Indoor/outdoor PCB communication error reported at the indoor unit
- What it means
- indoor unit: Indoor/outdoor PCB communication error reported at the indoor unit
- What to check first
- Match this meaning to your installed model and the unit that shows the code, then use the checks below.
What to do now
Use these steps before customer action, a signal-wire check, or PCB quote.
Stop using the unit if CH237 / CH238 returns
If CH237 / CH238 remains displayed or returns during operation, do not attempt a reset the manufacturer does not list; arrange diagnosis.
No manufacturer reset steps listed for CH237 / CH238
Capture the complete CH237 / CH238 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
CH237 / CH238 error code, a clear display photo, LG model stickers, affected rooms, operating state when the code appeared, and whether one room or every room failed
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 | What it says |
|---|---|
| Diagnostic note | Outdoor-unit power plug disconnected or aircon circuit breaker switched off. Secure the outdoor-unit power connection or breaker, and request service if power cannot be restored safely. |
| Diagnostic note | Record 237 and confirm that the indoor unit reported it. Have the technician trace the applicable communication wiring, plugs, addressing, and board communication path before replacing PCBs. |
| Diagnostic note | Record 238 and confirm that the indoor unit reported it. Have the technician trace the applicable communication wiring, plugs, addressing, and board communication path before replacing PCBs. |
| Singapore / model note | Official LG help-library guide lists 237/238 and explains that newer models may require both indoor and outdoor units to be powered. |
| 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. |
- Detail
- Diagnostic note
- What it says
- Outdoor-unit power plug disconnected or aircon circuit breaker switched off. Secure the outdoor-unit power connection or breaker, and request service if power cannot be restored safely.
- Detail
- Diagnostic note
- What it says
- Record 237 and confirm that the indoor 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 238 and confirm that the indoor 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
- Official LG help-library guide lists 237/238 and explains that newer models may require both indoor and outdoor units to be powered.
- 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. 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 CH237 / CH238, take a clear display photo. | Match CH237 / CH238 against your model family's listing before parts are quoted. |
| Capture the LG indoor and outdoor model stickers so the correct family row is used. | Test communication terminals, cable continuity, polarity, and outdoor power. |
| The manufacturer lists no customer reset procedure for this code. 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. |
- You can check
- Before taking any system action on CH237 / CH238, take a clear display photo.
- Technician should confirm
- Match CH237 / CH238 against your model family's listing before parts are quoted.
- You can check
- Capture the LG 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 CH237 / CH238 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 CH237 / CH238 questions
What does the LG CH237 / CH238 error mean?
Can I fix a LG CH237 / CH238 error myself?
Is it safe to keep running the aircon with a CH237 / CH238 error?
What causes a LG CH237 / CH238 error?
Will a LG CH237 / CH238 error need a repair or a full replacement?
What should I send a technician about a LG CH237 / CH238 error?
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Use these if the quote mentions the parts, checks, or repair path this code points to.