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. Official and unofficial listings both cover this code, so the model family decides which one the diagnosis follows. 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.
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 manufacturer 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
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 |
|---|---|---|
| CH24 | Splits and Multi Splits = high or low pressure trip. | 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 — master outdoor unit: High-pressure switch protection | master outdoor unit: High-pressure switch protection | 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 — slave 1 outdoor unit: High-pressure switch protection | slave 1 outdoor unit: High-pressure switch protection | 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 — slave 2 outdoor unit: High-pressure switch protection | slave 2 outdoor unit: High-pressure switch protection | Match this meaning to your installed model and the unit that shows the code, then use the checks below. |
- Code
- CH24
- What it means
- Splits and Multi Splits = high or low pressure trip.
- 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 — master outdoor unit: High-pressure switch protection
- What it means
- master outdoor unit: High-pressure switch protection
- 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 — 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 meaning to your installed model and the unit that shows the code, then use the 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 meaning to your installed model and the unit that shows the code, then use the checks below.
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 | 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. |
- 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.
- 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.
- 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.
- Detail
- Singapore / model note
- What it says
- Unattributed LG fault-code list; confirm against the installed model/service manual before applying.
- 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 manufacturer lists no customer reset procedure for this code. 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 manufacturer lists no customer reset procedure for this code. 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?
Where to go next
Confirm the fault
Share the error code, model number and symptoms so we can assess the likely cause.
Not the right code?
Browse the full LG list or check a few codes in the same fault category.
Read next
Use these if the quote mentions the parts, checks, or repair path this code points to.