LG Air Conditioner Error Code 141

Error code 141 indicates that the Sub2 outdoor unit has detected a reverse phase connection or a disconnection in its R, S, T three-phase power supply. The system locks out to prevent the compressor from running in the wrong direction, which would cause mechanical damage. Correcting the wiring sequence or reconnecting the loose conductor will resolve the fault.

No. The system is designed to prevent operation when this fault is active, and attempting to force the unit on with incorrect phase wiring would cause the compressor to rotate in reverse, leading to serious mechanical damage and potential compressor failure. Leave the unit off until the wiring issue is diagnosed and corrected.

A power reset will temporarily clear the fault display, but the error will return immediately on startup if the underlying wiring problem has not been corrected. The phase sequence detection runs each time the unit attempts to start, so the code will reappear until the R, S, T connections are properly verified and corrected at the Sub2 outdoor unit.

Diagnosing and correcting three-phase power wiring requires working inside electrical panels and terminal blocks at line voltage levels, which is hazardous without proper training and equipment. A licensed electrician or certified HVAC technician should perform this repair. If you are technically experienced and the issue is simply a transposed wire at the outdoor unit terminal block, re-landing the conductors in the correct R, S, T order can resolve it, but always shut off power at the disconnect before touching any wiring.

If the fix is simply re-terminating correctly ordered wires at the outdoor unit terminal block, labor costs from a technician could range from roughly $75 to $200 depending on your area. If upstream wiring needs to be replaced or a control board has failed, costs can range from $200 to $800 or more including parts and labor. Getting a diagnosis from a qualified technician will clarify which scenario applies.