ErrorCodeDoctor
LG Air Conditioner E4 error code
E4 is not an error code. It simply means your LG air conditioner has detected ice forming on the evaporator coil inside the indoor unit and has temporarily switched into defrost mode to melt it. This is a completely normal automatic function. The unit will stop cooling temporarily while defrosting and will resume normal operation once the ice has cleared. No action is needed.
Common causes
- Ice buildup detected on the evaporator coil during normal operation
- Defrost mode triggered automatically as a protective measure
How to fix it
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1
No action is needed — the unit is working as designed
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2
Wait for the defrost cycle to complete and the unit will resume cooling automatically
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3
If E4 appears very frequently check that the air filter is clean as a clogged filter can cause excessive ice buildup
Related LG Air Conditioner error codes
E4 error — frequently asked questions
What does the E4 error mean on a LG air conditioner?
The unit has entered defrost mode to melt ice on the evaporator
What causes the E4 error?
The E4 error is usually caused by: Ice buildup detected on the evaporator coil during normal operation; Defrost mode triggered automatically as a protective measure.
Can I fix the E4 error myself?
Yes — this is rated an easy fix that most people can do themselves, typically in Wait for defrost cycle to complete.
How much does it cost to fix the E4 error?
Fixing the E4 error on a LG air conditioner typically costs $0, depending on parts and whether you do it yourself or hire a technician.
Is it safe to keep using my air conditioner with the E4 error?
In most cases yes, but it's best to address the E4 error soon — see the fix steps below to resolve it.