This site is not affiliated with LG; this is an independent explanation.
The LG AC CH 10 error code appears on the display of an LG split or inverter AC when the indoor unit cannot confirm that its fan motor is turning properly. On most models CH10 is tied to the indoor fan motor, the brushless type that sends a speed signal back to the control board. If the signal is missing or the fan is stuck, the AC stops to protect itself.
The exact meaning can vary by series, so check the manual or ask LG authorised service to confirm for your model. A few simple checks are safe for you. Motor, wire and board work belongs to a trained technician.
Common causes
1Fan blade rubbing or blocked by dirt
How to tellScraping or buzzing sound, or the blower wheel looks clogged with dust
What fixes itSwitch off, clean the front filters and have the blower cleaned by service
2Motor stuck after a long idle period
How to tellAppears on the first start of the season, fan barely moves
What fixes itPower reset once; a technician frees or replaces the motor
3Weak or failing fan motor
How to tellFan speed hunts, slows down, or stops after some minutes
What fixes itMotor replacement by a technician
4Loose motor plug or damaged signal wire
How to tellCode is intermittent, worse after cleaning or when the unit shakes
What fixes itTechnician reseats or replaces the connector and wire
5Control board not driving the motor
How to tellMotor is fine when tested but the code returns every time
What fixes itBoard test and repair by a technician
6Voltage dips at start up
How to tellShows after a power cut or with heavy loads in the house
What fixes itCheck supply stability, then reset
How to fix it, step by step
Confirm the display really reads CH10
On LG units a code is shown with the letters CH and two digits. CH10 is easy to mix up with CH01 or CH11 on a dim screen, so read the display from straight in front.
Switch off and look at the air outlet
With the AC off, check that nothing, such as a curtain, a paper or a toy, is blocking the louvre. Look at the airflow from the side, but keep fingers away from the moving parts and do not push anything into the vents.
Take out and wash the dust filters
Lift the front panel, pull the filters, wash them gently in water and let them dry fully before refitting. A dusty filter makes the fan work hard and leaves the blower wheel dirty too.
Cut the supply for a few minutes
Flip the AC's own breaker, leave the unit lamps dark for several minutes, then power on and select Cool or Fan. This clears a one time start up failure.
Listen when it starts
Set the mode to Fan only. A healthy fan builds speed smoothly. A grinding sound, a clicking or no movement at all tells you to stop and call service.
Do not keep forcing restarts
Each restart makes the motor try to spin against the fault. Two attempts are enough before you stop.
Book LG authorised service
Tell them your model, that you see CH10, and what the fan sounded like. Browse the LG AC error code list to see where CH10 sits among the other displays.
What the lg ac ch 10 error code means
An LG indoor fan has a motor and a small sensor that tells the board how fast it turns. The board expects a certain speed within seconds of starting. If it hears nothing or sees the wrong speed, it shows CH10 and shuts the cooling down, otherwise the coil would freeze or overheat.
You switch on the AC for the first time after winter. The display shows CH10 after a few seconds, and the blower stays still. Dust has jammed the blower wheel and the motor could not move it, so a service cleaning is the fix.
Inverter, dual inverter and non inverter models
People search for lg inverter ac ch 10 error code, lg dual inverter ac ch 10 error code and lg non inverter ac ch 10 error code, and on most models the idea is the same: the indoor fan. A split AC and a dual inverter use the same type of indoor motor, although parts and wiring differ. Do not rely on a friend's repair, because parts are model specific.
| Check | Who does it |
|---|---|
| Blockage and dirty blower | You for the filters, service for the blower |
| Motor connector and wire | Technician |
| Motor itself | Technician |
| Control board output | Technician |
CH10 compared with other LG codes
CH10 is about the indoor fan. A broken link with the outdoor half has a separate code, covered on the LG CH05 page. Sensor codes and compressor codes sit elsewhere in the list. If the outdoor unit never starts, CH10 is probably not your story. Read the code again and compare it with the right page.
Safety, warranty and repair cost
Do not remove the indoor cover to reach the motor. The board and wires carry mains voltage, and opening the unit may void the warranty. Do not spray water or lubricant on the motor.
A cleaning visit is the lowest cost. A motor replacement costs more, and a board costs the most. What you pay turns on the part, the cover under warranty and how awkward the unit is to reach, so get the estimate in writing first.
How to stop CH10 coming back
Wash the filters often, book a yearly service that includes the blower, and keep the room free of heavy dust and smoke. If the AC will be unused for months, run it in fan mode for a while before the hot season. If cooling is poor and no code shows, work through the general cooling checklist instead.
Frequently asked questions
What does the CH10 error mean in an LG AC?
On most models it means the indoor fan motor is stuck or its speed signal is missing. The AC stops so the coil does not freeze.
How do I reset the LG ch 10 error code?
Switch the AC off at its breaker, wait a few minutes and start again. If CH10 returns, the fan or its wiring has a real fault, and a reset will not help.
Can I fix the LG CH10 error myself?
You can check for blockage and clean the filters. Opening the cover, touching the motor or testing wires is skilled work for the service engineer.
Is CH10 the same on LG inverter and non inverter ACs?
Mostly yes, as it refers to the indoor fan on both (lg inverter ac ch10 error code searches point the same way). Some series may differ, so confirm with your manual or LG authorised service.
Will the AC still cool with CH10 on the display?
Usually not for long. Without a working indoor fan the air does not move, so cooling stops and the coil can freeze.