Outdoor 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 outdoor board is not getting a rotation signal from the outdoor BLDC fan motor, so the fan is stopped or restricted. The unit stops the compressor at once, because running it without the outdoor fan raises pressure and temperature quickly. 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: CH62CH61CH10CH21

Symptoms4

• CH67 shows and the outdoor fan does not turn, or turns and then stops.
• The compressor stops a few minutes after starting.
• Rubbing or clicking from the outdoor unit before the code appears.
• The code may appear after a dust storm or strong wind.

Possible causes6

• A foreign object, branches or a plastic bag blocking the blade, or a broken blade hitting the grille.
• Worn motor bearing seized by heat and dust.
• Strong wind spinning the blade backward at start-up, so the start attempt fails.
• Loose or corroded motor connector.
• Failed BLDC fan motor.
• Faulty fan drive circuit on the outdoor PCB.

How to diagnose5

1. Switch off at the breaker, then turn the outdoor fan blade gently by hand: it should spin freely without rubbing or noise.
2. Remove any trapped object and check the blade is not broken.
3. After discharge, a technician checks the motor connector and wiring.
4. Test the motor and board per the LG manual, or try a known-good motor to find the failed part.
5. If the unit faces strong direct wind, review the installation position.

How to fix5

1. Remove the obstruction and replace a broken blade.
2. Secure and clean the motor connector.
3. Replace the outdoor fan motor if it is seized or failed.
4. Replace the outdoor PCB if the motor is good.
5. Run the unit and confirm the fan turns steadily and the compressor keeps running.

Repair cost

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

Clearing an obstruction or securing the plug costs little; a new outdoor fan motor costs more, and the top of the range is the outdoor inverter PCB.

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