LG Mini Split Error Codes Explained (2026)
🕒 Last updated:
LG error codes — quick lookup
Common LG (CH = 'Check') mini-split & AC codes. Codes can vary by model — confirm against your unit's LG manual.
| Code | What it means | What to do |
|---|---|---|
CH01 | Indoor air (room) temperature sensor — open/short | Technician — sensor check |
CH02 | Indoor pipe (inlet) sensor — open/short | Technician — sensor check |
CH04 | Drain pump / float switch fault | Clear the condensate drain; persists → tech |
CH05 | Indoor ↔ outdoor communication error (often wiring) | Power-cycle; inspect connecting wiring; persists → tech |
CH06 | Indoor pipe (outlet) sensor fault | Technician — sensor |
CH07 | Indoor units set to conflicting modes (multi-split) | Set all indoor units to the same mode |
CH10 | Indoor fan (BLDC) motor locked | Clear obstructions; persists → technician |
CH21 | Compressor inverter (IPM) over-current | Power off — technician (compressor) |
CH22 | Compressor high current | Technician (compressor) |
CH23 | DC link low voltage | Technician — power supply |
CH26 | Compressor position / start fault | Technician (compressor) |
CH38 | Low refrigerant (leak) or unstable power | Technician — EPA 608, not DIY |
CH53 | Communication (indoor → outdoor signal) error | Power-cycle; check wiring; persists → tech |
CH67 | Outdoor fan motor locked | Clear debris around the outdoor fan; persists → tech |
LG mini-split and air conditioning systems show a “CH” code — short for “Check” — followed by a number on the indoor unit’s display or wireless remote when they detect a fault. The number points to the affected area: low CH numbers usually mean indoor sensors, the CH05/CH53 range means communication between the indoor and outdoor units, the CH20s point to the compressor and inverter, and CH38 flags low refrigerant or a power problem. Use the quick-answer table above to find your exact LG error code, what it means, and the safe first step. Some codes clear after a simple power cycle or a basic fix like cleaning the filter; others — especially compressor, refrigerant, and communication faults — need a licensed technician. Always confirm the code against the list in your model’s LG manual, as meanings can vary by unit.
How to read an LG error code
LG shows the fault as a CH (Check) code on the indoor unit’s display, or signals it by blinking the indicator LEDs. On systems with a wired controller, the code shows on the controller screen. Note the exact number, then match it to the table above.
What the CH number points to
| CH range | Area of the system |
|---|---|
| CH01–CH06 | Indoor sensors (air / pipe) |
| CH04 | Drain pump / float |
| CH05 · CH53 | Indoor ↔ outdoor communication |
| CH07 | Mode conflict (multi-split) |
| CH10 · CH67 | Fan motors (indoor / outdoor) |
| CH21–CH26 | Compressor & inverter |
| CH38 | Refrigerant charge / power supply |
What to do first
For sensor, fan, and communication codes, start simple:
- Turn the unit off with the remote.
- Switch off the circuit breaker for about a minute.
- Restore power and let the unit restart.
- Clean the air filter and clear any obstruction around the indoor and outdoor units.
If the same code returns, stop — a repeating code means the underlying problem is still present. Don’t keep resetting compressor or refrigerant codes.
Popular LG codes explained in detail
Some codes come up often enough to deserve their own step-by-step guide:
- LG CH05 error code — indoor-outdoor communication error (often shown as 5 indicator flashes), usually the connecting wiring.
- LG CH38 error code — low refrigerant (usually a leak) or unstable power; the refrigerant part needs an EPA-608 technician.
Sources
- LG published error-code and service documentation (CH-code list; air-conditioner troubleshooting references). Look up the exact code list for your model number on LG’s official support.
Trademark note: “LG” is a trademark of LG Electronics. This page is an independent homeowner resource and is not affiliated with, authorized by, or endorsed by LG. Brand and code references are used factually for identification and troubleshooting only.
Frequently asked questions
How do I read an LG mini split error code?
LG systems show a "CH" (Check) code followed by a number on the indoor unit's display, or signal it by blinking the indicator LEDs. Note the exact CH number, then look it up — the number points to the affected area, such as a sensor, communication, the fan, or the compressor. Always confirm the meaning against your model's LG manual, as codes can vary slightly by unit.
What does CH05 mean on an LG mini split?
CH05 is a communication error between the indoor and outdoor units — they've stopped exchanging signals. It's most often a wiring problem on the connecting cable (loose, miswired, or damaged), or a control-board fault. Power-cycle once; if CH05 returns, the wiring and boards need a technician's inspection.
What does CH38 mean on an LG air conditioner?
CH38 indicates low refrigerant (a possible gas leak) or an electrical fault from unstable power. Because refrigerant is a sealed system, low charge means a leak that an EPA 608-certified technician must find and repair — it isn't a DIY fix.
Can I reset an LG error code myself?
You can safely try one power cycle: turn the unit off, switch its breaker off for about a minute, then restore power. This clears many temporary faults. If the same CH code returns, stop resetting — the underlying problem is still present and needs diagnosis.
When should I call a professional for an LG CH code?
Call a licensed HVAC technician for any compressor, refrigerant, or high-voltage code (for example CH21, CH22, CH23, CH26, and CH38), and for any code that returns after one power cycle. Refrigerant handling requires EPA Section 608 certification.