LG aircon CH24 error code
Use this LG CH24 error code guide to decide when to stop resetting, what to capture, and what to check before parts are quoted. Cross-check the exact model because the row is unofficial.
What does LG CH24 mean?
LG CH24 is listed as splits and Multi Splits = high or low pressure trip in the loaded residential diagnostic rows. The loaded row is unofficial, so do not approve parts from this code alone. Confirm the exact model, series, or signal row before accepting a parts quote.
Low refrigerant, active leak, restriction, or abnormal pressure reading.
Dirty condenser, weak outdoor fan, blocked airflow, or high-load operation.
Pressure sensor, expansion path, or compressor protection after readings are taken.
What to do now
Use these steps before another reset, gas work, 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.
Reset CH24 once
Capture the CH24 display, then power-cycle once only if the unit is not icing, leaking, or tripping. Do not use reset as a gas or pressure fix.
Send these to us
CH24 error code, a clear display photo, LG model stickers, affected rooms, reset result, 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 |
|---|---|
| Source repair action | Splits and Multi Splits = high or low pressure trip. Low at 1 bar, high at 35 bar; check pressures. Multi V = high pressure trip. |
| Singapore / model note | Unattributed LG fault-code list; confirm against the installed model/service manual before applying. |
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 resetting 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. |
| Treat the code as a starting point and note the exact symptoms because this row is not brand-official yet. | Leak-check or pressure-test before recommending another refrigerant top-up. |
What changes the next step
These clues decide whether the first check is room-side, shared outdoor-side, refrigerant-side, source-table, or model-family confirmation.
| What you see | What it points to |
|---|---|
| Only one indoor unit shows CH24. | The affected room, indoor board path, wiring route, or local component should be checked first. |
| Several rooms or the outdoor unit show the same CH24 fault. | The shared outdoor side, power path, communication trunk, or refrigerant circuit needs priority checking. |
| Cooling is weak, frost appears, or the outdoor unit trips under load. | Pressure, airflow, leak, and condenser checks should come before another top-up. |
| The model family is different from the row you found online. | Use the model or series filter first; same-looking codes can still belong to different diagnostic tables. |
| The model belongs to the loaded residential diagnostic rows. | The loaded row is unofficial, so do not approve parts from this code alone. Use the matching source row before quoting parts. |
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?
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.
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Read next
Use these if the quote mentions the parts, checks, or repair path this code points to.