LG AC CH26 Error — Outdoor DC Motor Fault Fix Guide

What Does This Error Mean?

CH26 is the outdoor fan motor's equivalent of CH07 — the inverter board can't read the motor's feedback or it isn't spinning at the commanded speed.
The system stops cooling because without outdoor airflow the compressor would overheat in seconds.
Power the outdoor unit off at the breaker for 10 minutes.
If the code returns once airflow restarts, the outdoor motor or its drive section needs replacement.

Affected Models

LG dual inverter split
LG art cool outdoor
LG multi-zone outdoor
LG window inverter

Common Causes

Outdoor fan blade jammed — leaves, snow, ice, an animal nest
Outdoor motor bearings seized from years of weather exposure
Outdoor PCB inverter section damaged from a power surge
Hall-effect sensor inside the outdoor motor failed
Wiring damaged by rodents — common on outdoor units

How to Fix It

Cut power at the breaker for 10 minutes.

The outdoor PCB has large capacitors that need to discharge.
Just toggling the remote off isn't enough.
Pull the breaker for the outdoor unit, wait, then restore power.
Inspect the outdoor fan.

Walk around to the outdoor unit.
Look through the grill at the fan.
It should be clear of leaves, debris, snow, anything wrapped around the blade.
If you see something, kill power again and clear it before restarting.
Spin the fan by hand.

With the breaker off, reach a finger or a stick through the grill and turn the fan blade.
It should rotate freely.
If it grinds, sticks, or won't move, the motor bearings are gone.
That's a motor replacement.
Check for rodent damage.

Outdoor units sit unused for months at a time.
Mice and squirrels chew the wiring insulation.
With power off, look at the wiring inside the access panel.
If you see chewed insulation or droppings, that's the fault — get it repaired by a tech, not patched yourself.
Call a technician if CH26 returns.

Outdoor inverter motor diagnosis needs a meter and the LG service manual.
It's not a DIY repair.
If you've cleared debris and the fan turns freely but the code returns, leave the rest to someone trained on these systems.

Frequently Asked Questions

Will running the unit with CH26 hurt anything?

It can.
The unit will mostly refuse to run, but if it does briefly, the compressor will overheat without outdoor airflow.
That's a much more expensive failure than the fan motor itself.
Don't bypass or ignore CH26 — fix the cause.

Is CH26 worse than CH07?

Not worse — it's just outdoor instead of indoor.
The mechanism and severity are similar.
Outdoor faults are slightly trickier to diagnose because of weather and pest exposure, but the fix path is the same: clear physical jams, then replace the motor or PCB if needed.