LG Air Conditioner Error Code E108

E108 on an LG air conditioner indicates a duplicate address conflict in a multi-unit network. Two or more devices on the system have been assigned the same network address, preventing the controller from communicating with each unit independently. The system flags this error to alert that the address configuration must be corrected before normal operation can resume.

The E108 error reflects a network communication conflict, not an electrical or refrigerant hazard, so there is no immediate safety risk to the home. However, operating the system with this fault active means the controller cannot reliably communicate with all units, which can result in improper cooling, heating, or system behavior. It is best to address the error promptly to avoid further operational issues or potential secondary faults from miscommunication between units.

If the fix involves only reconfiguring address settings with no parts needed, a service call to diagnose and correct the addresses could range from around $75 to $200 depending on your location and the number of units involved. If the cause turns out to be a faulty communication board or damaged wiring that requires replacement parts, costs could range from $150 to $500 or more depending on parts and labor. Getting a quote from a certified LG technician after diagnosis will give you the most accurate estimate for your specific system.

Resolving E108 requires accessing the address settings on each indoor unit in the network, which typically involves locating DIP switches, rotary address dials, or running an auto-addressing sequence through the system controller. If you are comfortable with multi-split or VRF system configuration and can safely access each unit, you may be able to audit and correct the addresses yourself. However, many homeowners find this process complex enough to warrant calling a licensed HVAC technician who is familiar with LG network configuration procedures.

A simple power reset will typically not clear the E108 error on its own because the underlying cause, duplicate address assignments, remains in place after the system restarts. The network will detect the same conflict again upon initialization and re-trigger the fault. The error will only clear after the address settings on each unit have been corrected so that every device on the network holds a unique address.