LG AC CH10 Error — Indoor Blower Lock Fix Guide

What Does This Error Mean?

CH10 means the indoor blower (the BLDC fan motor) is locked — the board commanded it to spin and it didn't.
Most of the time this is a physical jam: a dust-stiffened bearing, fan blade hitting the housing, or ice buildup blocking rotation.
Power the unit off at the breaker, check that the fan turns by hand, then power back on.
If CH10 returns immediately, the motor itself is failing.

Affected Models

LG dual inverter split
LG art cool
LG ceiling cassette
LG multi-zone indoor unit

Common Causes

Fan blade frozen — ice on the indoor coil from a blocked drain
Bearing seized after years of running with a dirty filter
Fan blade physically blocked by debris or dislodged insulation
Motor harness disconnected from the indoor PCB
Motor driver chip on the indoor PCB damaged

How to Fix It

Cut power at the breaker for 10 minutes.

If there's ice on the indoor coil, the unit needs time to thaw.
Ten minutes off is the minimum.
If you can hear water dripping when you open the front panel, leave it longer until you stop hearing drips.
Open the front panel and check the fan.

Pop the cover and look at the long horizontal blower wheel.
Try to spin it with your finger.
It should turn freely with mild resistance.
If it grinds or won't budge, the bearing is gone or something is jammed against it.
Clean the filter and coil.

A jammed blower is often the symptom of long neglect.
Pull the air filter out, wash it, dry it.
If the coil behind it is matted with dust, that's the cause of the blockage that led to the lock.
Vacuum gently with a brush attachment.
Check the drain line.

Iced-up coils usually trace back to a clogged drain.
Find the condensate hose exit outside and confirm it drips during operation.
If it's dry while the unit is running, the line is blocked — that has to be cleared before the coil will stop freezing.
Call a technician if the blower won't spin freely.

A seized bearing or a failed motor driver isn't a DIY repair on these inverter blowers.
The motor and control are matched — replacing one without the other can damage both.
An LG-trained tech will do it correctly.

Frequently Asked Questions

What's the difference between CH07 and CH10?

Both are indoor-fan codes but they describe different failures.
CH07 is a feedback-signal fault — the board can't read the motor's speed sensor.
CH10 is a lock fault — the board commanded rotation and the motor didn't move at all.
The fix path overlaps but CH10 is more often a physical jam.

Can I keep using the AC if CH10 clears after a reset?

Short-term, yes.
Long-term, no.
If CH10 cleared after a reset and didn't come back for a week, the cause was probably one-off — ice, debris, a power dip.
If it returns within days, the motor is on its way out and should be replaced before it leaves you with no cooling on the hottest day of the year.