- HVAC
- Air conditioner
CH10
LG CH10 on an air conditioner: indoor unit fan problem
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
Medium
Quick answer
On LG air conditioners, CH10 (E6 on some models) means a problem with the indoor unit fan. With the unit off, look for debris or ice around the fans and remove it without opening the unit; if it stays, request service.
Safety first
Stop and check this first
- LG warns not to disassemble the air conditioner or replace internal parts yourself: it may cause fire, electric shock, serious injury or death. Boards, wiring and refrigerant are service technician work.
Safe checks you can perform
- Confirm it is CH10, not CH67
- Visible debris around the fans
- Testing fan and motor
Leave these tasks to a qualified professional
- Do not attempt this professional task: Test the motor before replacing the board
- Do not attempt this professional task: Operating test
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Test the motor before replacing the board
What they doThe technician checks rotation, motor and connection before proposing the board.
They must show youthe motor test result.
In writingwhich part was replaced and why.
Operating test
What they doAfter the repair the technician runs the unit and checks the fan at several speeds.
They must show youthe fan running with no code.
In writingdate and result.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Confirm it is CH10, not CH67
- Who:
- you.
- How:
- read the full code on the display.
- Result that matters:
- LG separates CH10 or E6 (indoor fan) from CH67 or EF (outdoor fan).
- If it is CH10 or E6:
- continue with this page.
- If it is CH67 or EF:
- it is the outdoor fan; this page does not apply.
- Evidence to keep:
- a photo of the display with the code.
Evidence: LG Air Conditioner - Guide to Error Codes
Visible debris around the fans
- Who:
- you.
- How:
- with the unit off and unplugged, look through the grilles for dirt, objects or snow buildup, and remove only what you can reach without tools.
- Result that matters:
- whether something was slowing the fan.
- If there was debris:
- remove it, restore power and check whether CH10 returns.
- If nothing is visible:
- LG says service may be required.
- Evidence to keep:
- a photo of what you found.
Evidence: LG Air Conditioner - Guide to Error Codes
Testing fan and motor
- Who:
- an air conditioning technician.
- How:
- with power isolated, checks the fan turns freely and tests the motor and its connection to the board.
- Result that matters:
- whether the fault is mechanical, in the motor or in the control.
- If the fan is blocked:
- a mechanical cause is confirmed.
- If it turns freely and the motor does not respond:
- motor and board are separated by measuring.
- Evidence to keep:
- a job sheet with the measurements and the reference of any part replaced.
Requires isolating power and opening the indoor unit: technician only.
Evidence: LG Air Conditioner - Guide to Error Codes
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- HVAC
- Brand
- LG
- Product type
- Air conditioner
Known code variants
- CH 10
- LG CH10
What it means
In its error code guide, LG attributes CH10 and E6 to issues with the indoor unit fan, and keeps CH67 and EF for the outdoor unit fan. The only owner action it gives is to look for and remove debris or snow buildup around the fans; if nothing is visible, it says service may be required. The code does not tell a blocked fan from the motor or its control on the board: a technician separates them.
Warnings and stop conditions
- Highsource verified
LG warns not to disassemble the air conditioner or replace internal parts yourself: it may cause fire, electric shock, serious injury or death. Boards, wiring and refrigerant are service technician work.
Evidence: LG Air Conditioner - Guide to Error Codes · How to Troubleshoot Error Codes CH01, CH02, CH06 on Your LG Air Conditioner
Symptoms and causes
Probable causes · in order
- Debris or obstacle around the fanPossible
LG asks you to look for buildup; it shows because the code clears after removing it and resetting.
Evidence: LG Air Conditioner - Guide to Error Codes
- Indoor fan motorPossible
If nothing is visible and the code stays, the technician tests the motor; LG only says service may be required.
Evidence: LG Air Conditioner - Guide to Error Codes
- Fan control on the boardPossible
With a sound motor, suspicion moves to the circuit that drives it; a technician's measurement confirms it.
Evidence: LG Air Conditioner - Guide to Error Codes
Virtual technician
Does CH10 still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
LG Air Conditioner - Guide to Error Codes
LG Electronics · 2026 · official_doc
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