LG Air Conditioner Error Code E389

E389 indicates a V-limit error on Fan2 of the compressor, meaning the system has detected that the secondary compressor fan motor is operating outside its acceptable voltage or speed range. LG's control system triggers this fault to protect the compressor from overheating. The outdoor unit will typically shut down when this error is active.

No, continuing to operate the unit with E389 active is not recommended. Fan2 is responsible for keeping the compressor cool, and running without proper fan operation can cause the compressor to overheat and fail. Compressor replacement is one of the most expensive AC repairs, so addressing E389 promptly is important.

Repair costs vary depending on the root cause. Fan motor replacement typically ranges from $150 to $400 including labor. If the inverter or control board is at fault, costs can range from $300 to $700 or more depending on parts availability. Getting a diagnostic from a certified technician will give you a more accurate estimate for your specific situation.

Some basic checks, such as clearing debris from the outdoor fan or inspecting visible wiring for obvious damage, can be done by a careful DIYer. However, diagnosing and replacing the fan motor, inverter board, or control board requires electrical knowledge and proper tools. Most repairs for this error code are best handled by a qualified HVAC technician.

A power reset may temporarily clear the error code, but if the underlying fault with Fan2 or its circuitry still exists, the error will return shortly after the unit restarts. A reset alone does not repair the root cause and should not be relied on as a solution. The fault needs to be properly diagnosed and repaired.