Indoor BLDC Fan Motor Lock

What it means

This code appears on LG inverter split air conditioners and on LG ducted and cassette units that use CH codes. It means the indoor board is not getting a rotation signal from the indoor BLDC fan motor, so the fan is stopped or turning far slower than commanded. The unit shuts down to protect the motor and the board. The same code can mean something else on other brands.

Models covered: LG inverter split air conditioners (e.g. Dual Inverter) and LG ducted/cassette units that use CH codes; the code shows as CH plus a number on the display or as LED blinks.

Related codes: CH67CH01CH05

Symptoms4

• CH10 shows and no air comes out of the indoor unit.
• Rubbing or clicking noise from the cross-flow fan before the code appears.
• The fan turns slowly or jerkily, then the unit stops.
• The code may appear after cleaning or after something fell into the unit.

Possible causes5

• Cross-flow fan jammed by built-up dirt, a foreign object, or shifting along the motor shaft.
• Worn motor bearing or fan bushing that makes the fan hard to turn.
• Loose or corroded motor connector.
• Failed BLDC fan motor (windings or internal sensor circuit).
• Faulty fan drive circuit on the indoor PCB.

How to diagnose5

1. Switch off at the breaker, open the louvers and turn the fan gently with a plastic stick: it should spin freely with no rubbing.
2. Look for heavy dirt or a foreign object inside the cross-flow fan.
3. A technician checks the motor connector on the board and the wiring.
4. The motor and board are tested per the LG service procedure, or a known-good motor is tried to find which part has failed.
5. Confirm the fan is firmly fixed on the motor shaft and has not moved to one side.

How to fix6

1. Clean the cross-flow fan and indoor unit and remove any trapped object.
2. Re-seat the fan on the shaft and replace the rubber bushing if worn.
3. Secure and clean the motor connector.
4. Replace the indoor fan motor.
5. Replace the indoor PCB if the motor is good.
6. Run the unit at all fan speeds and confirm steady rotation without the code returning.

Repair cost

In Saudi riyals; the highlighted part is the expected range for this fault.

Dirt or a jam is fixed with a low-cost cleaning; a new motor costs more, and a failed indoor PCB is the top of the range.

Prices are rough estimates including the part and the technician’s fee, and vary with brand, model and part source.
Prices last updated: September 2026

Frequently asked questions