ErrorCodeDoctor
LG Air Conditioner CH03 error code
The CH03 error means your LG air conditioner has detected that there is no refrigerant in the system. This may also appear as E3 on some models. Refrigerant does not get consumed during normal operation so if it is gone there is a leak somewhere in the system. This is not a user-fixable issue — refrigerant work must be carried out by a licensed technician. Do not continue using the unit as running without refrigerant will damage the compressor.
Common causes
- Refrigerant has leaked from the system through a crack or loose connection
- Refrigerant was not correctly charged during installation
- Refrigerant leak in the piping between the indoor and outdoor units
How to fix it
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1
Do not attempt to use the unit — running without refrigerant will damage the compressor
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2
Unplug the unit immediately
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3
Contact a licensed technician to locate the leak, repair it, and recharge the refrigerant
Related LG Air Conditioner error codes
CH03 error — frequently asked questions
What does the CH03 error mean on a LG air conditioner?
No refrigerant detected — the unit is out of refrigerant gas
What causes the CH03 error?
The CH03 error is usually caused by: Refrigerant has leaked from the system through a crack or loose connection; Refrigerant was not correctly charged during installation; Refrigerant leak in the piping between the indoor and outdoor units.
Can I fix the CH03 error myself?
This is rated a hard fix — it often requires tools, parts, or experience, and may be safer left to a professional technician.
How much does it cost to fix the CH03 error?
Fixing the CH03 error on a LG air conditioner typically costs $150–$400, depending on parts and whether you do it yourself or hire a technician.
Is it safe to keep using my air conditioner with the CH03 error?
We'd recommend addressing the CH03 error before continuing to use the air conditioner, since hard-rated issues often involve a real fault rather than a minor glitch.