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LG Air Conditioner CH01 / CH02 / CH06 Error Code

Temperature sensor fault. Here is what it means and how to clear it, easiest fix first.

CH01 / CH02 / CH06
May need a pro

The unit's self-check has flagged one of its temperature or pipe sensors (thermistors) and stopped running to protect itself. LG says the sensor may have failed or worked loose, but a fault on the main board or a short-lived electrical disturbance can also set off these codes.

LG groups a long list of sensor codes together: CH01, CH02, CH06, CH12 and CH41 through CH48. Some models show E1, E2, E3, E7, E8, F2 or F3 for the same family of faults. LG does not publish a one-to-one meaning for each, so check your owner's manual for which sensor your code points to.

Safety first: unplug the air conditioner (or switch off its breaker) before touching filters, hoses or panels. If you smell burning or gas, or see water near the outlet, stop and call a professional.

How to fix LG CH01 / CH02 / CH06

  1. Reset the power at the breaker

    Switch off the breaker that feeds the air conditioner (some systems have separate breakers for the indoor and outdoor units, so switch off both). Wait about five minutes, switch the power back on and restart the unit to see if the code clears.

  2. Watch whether it comes back

    If the unit runs normally after the reset, keep using it but note the code and the date. A sensor code that keeps reappearing points to a loose connection or failing part rather than a one-off glitch.

When to call a technician

Sensors and their connectors sit inside the indoor or outdoor unit, so a code that returns after a reset needs a technician. Don't open either unit to look for the sensor yourself.

Parts that commonly cause CH01 / CH02 / CH06

Order parts by your exact model number so they fit.

Other LG air conditioner codes

Frequently asked questions

What does CH01 / CH02 / CH06 mean on a LG air conditioner?

The unit's self-check has flagged one of its temperature or pipe sensors (thermistors) and stopped running to protect itself. LG says the sensor may have failed or worked loose, but a fault on the main board or a short-lived electrical disturbance can also set off these codes.

Can I fix LG CH01 / CH02 / CH06 myself?

Only the basic checks. You can safely try the steps above, but CH01 / CH02 / CH06 usually points to a part or fault that needs a technician.

What if CH01 / CH02 / CH06 keeps coming back?

A code that returns after a reset and the checks above usually means a part is wearing out. Note when CH01 / CH02 / CH06 appears (which cycle, how often) and have your model number ready; it helps a technician bring the right part on the first visit.

Last reviewed 2026-10-19. Codes and steps can vary by model; check your owner's manual.

References