Home › Air Conditioners › LG › CH38

LG Air Conditioner CH38 Error Code

Low refrigerant protection. Here is what it means and how to clear it, easiest fix first.

CH38
May need a pro

LG's error-code guide describes this as a low-refrigerant warning that stops the system to protect it from damage. If it appears soon after installation or after the unit was moved, LG says a refrigerant shortage is likely and the piping should be checked. LG's troubleshooting page also groups CH38 with compressor-related codes, so a compressor or outdoor electronics fault is possible too.

Some models show F4. LG also lists CH90 and CH91 as displaying F4 on some units during the test run. LG says its error-code guide covers all models, so the exact code and its meaning can differ on yours; check your owner's manual.

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 CH38

  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. Contact the installer if it's a new system

    If the code appeared after installation or relocation, call the installer. LG says the piping connections or refrigerant charge may need checking.

When to call a technician

Refrigerant leaks must be found and repaired by a licensed technician. Do not try to open the refrigerant lines or add refrigerant yourself.

Parts that commonly cause CH38

Order parts by your exact model number so they fit.

Other LG air conditioner codes

Frequently asked questions

What does CH38 mean on a LG air conditioner?

LG's error-code guide describes this as a low-refrigerant warning that stops the system to protect it from damage. If it appears soon after installation or after the unit was moved, LG says a refrigerant shortage is likely and the piping should be checked. LG's troubleshooting page also groups CH38 with compressor-related codes, so a compressor or outdoor electronics fault is possible too.

Can I fix LG CH38 myself?

Only the basic checks. You can safely try the steps above, but CH38 usually points to a part or fault that needs a technician.

What if CH38 keeps coming back?

A code that returns after a reset and the checks above usually means a part is wearing out. Note when CH38 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