LG Air Conditioner Error Code 15

Error code 15 on an LG air conditioner indicates that the compressor's three-phase power wiring, the U, V, and W terminals, is incorrectly connected or has a fault in the phase sequence. The unit shuts down the compressor to prevent motor damage. A power cycle and inspection of the compressor terminal wiring are the recommended first steps.

If you are comfortable working with appliance wiring, you can inspect the U, V, and W terminal connections at the compressor for loose or reversed wires after disconnecting power. However, because this involves a compressor motor and potentially three-phase wiring, most homeowners should have a qualified technician perform the diagnosis and repair to avoid safety risks and further damage.

If the issue is simply a loose or reversed wire, the repair cost may only involve a service call fee, typically in the range of $75 to $150. If the terminal block or wiring harness needs replacement, parts and labor could bring the total to $150 to $400 or more depending on your location and the specific components involved. A control board replacement would be at the higher end of repair costs.

Pulling the power cord and reinserting it will reset the fault and allow the unit to attempt operation again. However, if the underlying wiring problem is not corrected, error code 15 will return. A reset alone is not a fix, it is only a way to confirm whether the fault is persistent or intermittent.

The error code itself represents the unit's safety response to a wiring fault, and the system shuts down to protect the compressor motor from damage. Incorrect phase wiring can cause motor overheating or failure if left uncorrected. You should not attempt to repeatedly force the system to run while the fault is active.