LG Air Conditioner Error Code 115

Error code 115 on an LG air conditioner indicates that the outdoor unit's subcooling outlet temperature sensor has been detected as either open or shorted. This means the control board is receiving no signal or an out-of-range signal from the sensor that monitors refrigerant temperature at the subcooling circuit outlet. The unit will limit or stop operation until the fault is resolved. Diagnosis starts with inspecting the sensor's wiring connector for secure attachment and physical damage.

It is not advisable to continue operating the system while error code 115 is active. The subcooling outlet temperature sensor provides data the control system uses to manage refrigerant flow and protect the compressor. Running the unit without a valid sensor reading can lead to inefficient operation or compressor damage over time. Address the fault before resuming normal use.

A power reset may temporarily clear the error code display, but the code will return if the underlying sensor fault still exists. The control board will detect the open or shorted sensor signal again as soon as it runs its diagnostic checks. A reset is useful for confirming whether a fault is persistent, but it is not a repair. The sensor, wiring, and connector must be inspected and corrected to permanently resolve the error.

A homeowner comfortable with basic electrical inspection can check whether the sensor connector has come loose, as reconnecting it may clear the fault. However, testing sensor resistance, tracing wiring faults, and replacing the sensor or control board involves working inside the outdoor unit and requires a multimeter and basic electrical knowledge. Any work involving the refrigerant circuit should be left to a licensed HVAC technician.

If the fix is simply reseating a loose connector, there may be no parts cost, only a diagnostic service call fee which typically ranges from $75 to $150. Replacing the subcooling outlet temperature sensor itself usually costs between $50 and $150 for the part, plus labor. If the outdoor unit control board has failed, parts and labor can range from $300 to $700 or more depending on the unit model and market rates.