LG aircon CH47 error code
Use this LG CH47 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 CH47 mean?
LG CH47 is listed as compressor discharge sensor fault 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.
Open, shorted, displaced, or out-of-range thermistor or pressure-sensor reading.
Loose sensor connector, damaged sensor harness, or water-affected wiring.
PCB input fault after the sensor and wiring readings are confirmed.
What to do now
Use these steps before another reset, sensor check, or PCB quote.
Treat it as a fault signal
If CH47 returns or cooling is still abnormal, stop treating it as a simple reset issue.
Reset CH47 once
Capture the CH47 display first, then power-cycle once only and note whether the same fault returns.
Send these to us
CH47 error code, a clear display photo, LG model stickers, affected rooms, reset result, when the fault appears, 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 | Compressor discharge sensor fault. Disconnect from PCB and measure resistance: 237 kOhm at 20C and 168 kOhm at 30C. If OK replace PCB, if not replace sensor. |
| 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 CH47, take a clear display photo. | Confirm which sensor CH47 maps to on the exact model table. |
| Capture the LG indoor and outdoor model stickers so the correct family row is used. | Measure the sensor value against the service-manual resistance or voltage range. |
| Treat the code as a starting point and note the exact symptoms because this row is not brand-official yet. | Check connector condition, harness continuity, and PCB input before replacing boards. |
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 CH47. | The affected room, indoor board path, wiring route, or local component should be checked first. |
| Several rooms or the outdoor unit show the same CH47 fault. | The shared outdoor side, power path, communication trunk, or refrigerant circuit needs priority checking. |
| The fault appears immediately even before the unit cools properly. | Sensor value, connector, harness, and PCB input should be tested in that order. |
| 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. |
Sensor or PCB decision
LG CH47 is usually repair-first if a sensor or harness reading is confirmed. Board replacement should wait until the sensor circuit is tested.
Sensor replacement is usually targeted when resistance or voltage readings are out of range.
Harness or connector damage can look like a sensor fault until continuity is checked.
PCB replacement is a later step if the sensor and wiring test correctly.
LG CH47 questions
What does the LG CH47 error mean?
Can I fix a LG CH47 error myself?
Is it safe to keep running the aircon with a CH47 error?
What causes a LG CH47 error?
Will a LG CH47 error need a repair or a full replacement?
What should I send a technician about a LG CH47 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.