LG Air Conditioner Error Code E464

E464 indicates an over-current fault on inverter compressor 1 in the outdoor unit. The inverter control circuit detected that the compressor was drawing more current than the safe operating limit allows and shut the system down to prevent component damage. The fault can originate from the compressor windings, connection wiring, temperature sensors, or the inverter board itself.

No. The system has already shut down as a protective measure, and attempting to force operation with an active over-current fault risks burning out the compressor windings or damaging the inverter board. Both are expensive components, so it is important to diagnose and correct the underlying cause before restarting the unit.

Repair costs vary widely depending on the root cause. Tightening wiring connections or replacing a temperature sensor is relatively inexpensive, typically in the range of $75 to $250 including labor. Replacing the inverter board can range from $300 to $700 or more. Compressor replacement is the most expensive outcome, often ranging from $700 to $1,500 or higher depending on the unit size and local labor rates.

Some basic checks, such as inspecting the outdoor unit for blocked airflow or visually examining accessible wiring connections, can be done without special tools. However, accurately measuring compressor winding resistance, testing temperature sensor values, and diagnosing inverter board output requires proper electrical test equipment and knowledge of safe high-voltage procedures. Most homeowners should contact a certified technician for this repair.

A power reset may temporarily clear the fault display, but if the underlying cause is not corrected, the error will return as soon as the compressor attempts to start under the same conditions. Repeatedly resetting the unit without fixing the root problem can cause additional damage to the compressor or drive electronics.