LG Aircon CH24 Error Code
Use this LG CH24 error code guide to capture the fault correctly and see what should be checked before parts are quoted. Match the model first; some rows are unofficial or mean different things.
What does LG CH24 mean?
LG CH24 is listed as splits and Multi Splits = high or low pressure trip, master outdoor unit: High-pressure switch protection, and slave 1 outdoor unit: High-pressure switch protection in VRF, Cassette, Ducted rows such as LG Multi V 5 commercial VRF. The loaded rows include mixed source confidence, so the model family decides which row should carry the diagnosis. 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 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 |
|---|---|---|
| CH24 | Splits and Multi Splits = high or low pressure trip. | Match this row to the installed model or reporting unit, then use the source-specific checks below. |
| LG Multi V 5 commercial VRF — master outdoor unit: High-pressure switch protection | master outdoor unit: High-pressure switch protection | Match this row to the installed model or reporting unit, then use the source-specific checks below. |
| LG Multi V 5 commercial VRF — slave 1 outdoor unit: High-pressure switch protection | slave 1 outdoor unit: High-pressure switch protection | Match this row to the installed model or reporting unit, then use the source-specific checks below. |
| LG Multi V 5 commercial VRF — slave 2 outdoor unit: High-pressure switch protection | slave 2 outdoor unit: High-pressure switch protection | Match this row to the installed model or reporting unit, then use the source-specific checks below. |
- Code
- CH24
- What it means
- Splits and Multi Splits = high or low pressure trip.
- What to check first
- Match this row to the installed model or reporting unit, then use the source-specific checks below.
- Code
- LG Multi V 5 commercial VRF — master outdoor unit: High-pressure switch protection
- What it means
- master outdoor unit: High-pressure switch protection
- What to check first
- Match this row to the installed model or reporting unit, then use the source-specific checks below.
- Code
- LG Multi V 5 commercial VRF — slave 1 outdoor unit: High-pressure switch protection
- What it means
- slave 1 outdoor unit: High-pressure switch protection
- What to check first
- Match this row to the installed model or reporting unit, then use the source-specific checks below.
- Code
- LG Multi V 5 commercial VRF — slave 2 outdoor unit: High-pressure switch protection
- What it means
- slave 2 outdoor unit: High-pressure switch protection
- What to check first
- Match this row to the installed model or reporting unit, then use the source-specific checks below.
What to do now
Use these steps before customer action, gas work, a pressure check, or parts quote.
Stop using the unit if CH24 returns
Stop using the unit if CH24 returns with weak cooling, frost, hissing, or outdoor-unit tripping.
No manufacturer reset steps listed for CH24
Capture the complete CH24 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
CH24 error code, a clear display photo, LG model stickers, affected rooms, operating state when the code appeared, cooling-loss timeline and any recent gas top-up, and exact model so the source can be cross-checked
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 | Splits and Multi Splits = high or low pressure trip. Low at 1 bar, high at 35 bar; check pressures. Multi V = high pressure trip. |
| Diagnostic note | Record 241 and confirm that the master outdoor unit reported it. Avoid repeated resets and arrange pressure, airflow, valve, sensor, refrigerant-circuit, and compressor checks before approving a repair. |
| Diagnostic note | Record 242 and confirm that the slave 1 outdoor unit reported it. Avoid repeated resets and arrange pressure, airflow, valve, sensor, refrigerant-circuit, and compressor checks before approving a repair. |
| Singapore / model note | Unattributed LG fault-code list; confirm against the installed model/service manual before applying. |
| 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. |
- Source detail
- Diagnostic note
- What it says
- Splits and Multi Splits = high or low pressure trip. Low at 1 bar, high at 35 bar; check pressures. Multi V = high pressure trip.
- Source detail
- Diagnostic note
- What it says
- Record 241 and confirm that the master outdoor unit reported it. Avoid repeated resets and arrange pressure, airflow, valve, sensor, refrigerant-circuit, and compressor checks before approving a repair.
- Source detail
- Diagnostic note
- What it says
- Record 242 and confirm that the slave 1 outdoor unit reported it. Avoid repeated resets and arrange pressure, airflow, valve, sensor, refrigerant-circuit, and compressor checks before approving a repair.
- Source detail
- Singapore / model note
- What it says
- Unattributed LG fault-code list; confirm against the installed model/service manual before applying.
- Source 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 | Technician should confirm |
|---|---|
| Before taking any system action on CH24, take a clear display photo. | Match CH24 to low-pressure, high-pressure, leak, or refrigerant-cycle protection. |
| Capture the LG indoor and outdoor model stickers so the correct family row is used. | Measure operating pressures, coil temperatures, airflow, and outdoor fan condition. |
| The selected source row lists no customer reset procedure. Note whether one room, several rooms, or the whole system is affected. | Leak-check or pressure-test before recommending another refrigerant top-up. |
- You can check
- Before taking any system action on CH24, take a clear display photo.
- Technician should confirm
- Match CH24 to low-pressure, high-pressure, leak, or refrigerant-cycle protection.
- You can check
- Capture the LG indoor and outdoor model stickers so the correct family row is used.
- Technician should confirm
- Measure operating pressures, coil temperatures, airflow, and outdoor fan condition.
- You can check
- The selected source row lists no customer reset procedure. Note whether one room, several rooms, or the whole system is affected.
- Technician should confirm
- Leak-check or pressure-test before recommending another refrigerant top-up.
Pressure, leak, or airflow decision
LG CH24 needs measured pressure, airflow, and leak evidence before gas work is approved. Replacement only becomes serious when the leak, compressor, or coil repair is uneconomical.
A top-up alone is poor value if the leak source is not found.
High-pressure faults often come from airflow, condenser, fan, or overcharge conditions.
Coil leaks or compressor-related findings can shift older systems toward replacement.
LG CH24 questions
What does the LG CH24 error mean?
Can I fix a LG CH24 error myself?
Is it safe to keep running the aircon with a CH24 error?
What causes a LG CH24 error?
Will a LG CH24 error need a repair or a full replacement?
What should I send a technician about a LG CH24 error?
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