LG Aircon CH22 Error Code & Blinking Light
Capture the LG CH22 fault correctly, then see what should be checked before parts are quoted. Match the model first; same-looking signals can point to different rows.
What does LG CH22 mean?
LG CH22 is listed as CT2 error; alternating current input too high, current transformer2 error; AC input current too high, and master outdoor unit: Inverter-PCB AC input overcurrent fault in Wall-Mounted Split, VRF, Cassette rows such as HSV4 / HSV5 single-zone wall-mounted systems, LS091HSV / LS121HSV wall-mounted single-zone. 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 |
|---|---|---|
| HSV4 / HSV5 single-zone wall-mounted systems | CT2 error; alternating current input too high | Match this meaning to your installed model and the unit that shows the code, then use the checks below. |
| LS091HSV / LS121HSV wall-mounted single-zone | Current transformer2 error; AC input current too high | 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: Inverter-PCB AC input overcurrent fault | master outdoor unit: Inverter-PCB AC input overcurrent fault | 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: Inverter-PCB AC input overcurrent fault | slave 1 outdoor unit: Inverter-PCB AC input overcurrent fault | 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: Inverter-PCB AC input overcurrent fault | slave 2 outdoor unit: Inverter-PCB AC input overcurrent fault | Match this meaning to your installed model and the unit that shows the code, then use the checks below. |
- Code
- HSV4 / HSV5 single-zone wall-mounted systems
- What it means
- CT2 error; alternating current input too high
- What to check first
- Match this meaning to your installed model and the unit that shows the code, then use the checks below.
- Code
- LS091HSV / LS121HSV wall-mounted single-zone
- What it means
- Current transformer2 error; AC input current too high
- 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: Inverter-PCB AC input overcurrent fault
- What it means
- master outdoor unit: Inverter-PCB AC input overcurrent fault
- 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: Inverter-PCB AC input overcurrent fault
- What it means
- slave 1 outdoor unit: Inverter-PCB AC input overcurrent fault
- 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: Inverter-PCB AC input overcurrent fault
- What it means
- slave 2 outdoor unit: Inverter-PCB AC input overcurrent fault
- 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 or a parts quote.
Stop using the unit if CH22 returns
Stop repeated restarts if CH22 returns; compressor and inverter faults can become more expensive when forced to run.
No manufacturer reset steps listed for CH22
Capture the complete CH22 pattern 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
CH22 error code and blinking light, a clear display photo and blinking-light video if the unit shows one, LG model stickers, affected rooms, operating state when the code appeared, and trip timing and outdoor-unit behaviour
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 | Stop repeated resets and arrange outdoor current-sensing, compressor, and inverter diagnosis. |
| Diagnostic note | Record the exact code and LED blink pattern before booking diagnosis. For LS091HSV / LS121HSV systems, this pattern points to: Current transformer2 error; AC input current too high |
| Diagnostic note | Record 221 and confirm that the master outdoor unit reported it. Isolate the system through a qualified technician and verify the relevant supply, wiring, inverter, PCB, and compressor path against the installed model manual. |
| Singapore / model note | Official LG HVAC HSV4 / HSV5 wall-mounted self-diagnosis table. Use this row only for matching single-zone wall-mounted systems. |
| Singapore / model note | Use this LS091HSV / LS121HSV LED table only when the installed model or service manual matches this standard wall-mounted single-zone family. |
| 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
- Stop repeated resets and arrange outdoor current-sensing, compressor, and inverter diagnosis.
- Detail
- Diagnostic note
- What it says
- Record the exact code and LED blink pattern before booking diagnosis. For LS091HSV / LS121HSV systems, this pattern points to: Current transformer2 error; AC input current too high
- Detail
- Diagnostic note
- What it says
- Record 221 and confirm that the master outdoor unit reported it. Isolate the system through a qualified technician and verify the relevant supply, wiring, inverter, PCB, and compressor path against the installed model manual.
- Detail
- Singapore / model note
- What it says
- Official LG HVAC HSV4 / HSV5 wall-mounted self-diagnosis table. Use this row only for matching single-zone wall-mounted systems.
- Detail
- Singapore / model note
- What it says
- Use this LS091HSV / LS121HSV LED table only when the installed model or service manual matches this standard wall-mounted single-zone family.
- 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 CH22, take a clear display photo and blinking-light video if the unit shows one. | Confirm whether CH22 is compressor start, overload, lock, or drive protection. |
| Capture the LG indoor and outdoor model stickers so the correct family row is used. | Check supply voltage, inverter output, IPM status, compressor current, and winding readings. |
| The manufacturer lists no customer reset procedure for this code. Note whether one room, several rooms, or the whole system is affected. | Review trip history and compressor mechanical signs before quoting replacement. |
- You can check
- Before taking any system action on CH22, take a clear display photo and blinking-light video if the unit shows one.
- Technician should confirm
- Confirm whether CH22 is compressor start, overload, lock, or drive protection.
- You can check
- Capture the LG indoor and outdoor model stickers so the correct family row is used.
- Technician should confirm
- Check supply voltage, inverter output, IPM status, compressor current, and winding readings.
- 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
- Review trip history and compressor mechanical signs before quoting replacement.
Compressor drive or replacement decision
LG CH22 can still be a repair if power, inverter, or module checks find the cause. Compressor replacement should be weighed against age, warranty, and the rest of the system condition.
Inverter or IPM faults are not the same as confirmed compressor mechanical failure.
Compressor winding and current readings should be measured before replacement is discussed.
Older systems need a repair-versus-replace check if compressor-side parts are expensive.
LG CH22 questions
What does the LG CH22 error mean?
Can I fix a LG CH22 error myself?
Is it safe to keep running the aircon with a CH22 error?
What causes a LG CH22 error?
Will a LG CH22 error need a repair or a full replacement?
What should I send a technician about a LG CH22 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.