LG Air Conditioner Error Code 114

Error code 114 on an LG air conditioner indicates that the outdoor unit sub-cooling inlet or outlet temperature sensor has an abnormal resistance value, consistent with either an open or short circuit condition. The system uses this sensor to monitor refrigerant temperatures in the sub-cooling circuit, and when the reading falls outside acceptable parameters, the error is triggered. The fault can originate from the sensor itself, the connector, the wiring, or in rare cases the control board.

It is generally not advisable to continue running the unit with error 114 active. The sub-cooling temperature sensor provides data the control board uses to manage refrigerant conditions, and operating without accurate readings could lead to reduced efficiency or potential stress on system components. The unit may also reduce operation or shut down automatically as a protective measure.

A reset may temporarily clear the error code, but if the underlying sensor or wiring fault still exists, the code will return once the system attempts to read the sensor again. Resetting without addressing the root cause is not a lasting solution. The error should be diagnosed and the defective component repaired or replaced before relying on the system for normal operation.

A knowledgeable DIYer can perform some of the initial diagnostic steps, such as inspecting the sensor connector for looseness or corrosion and reseating it. However, measuring sensor resistance accurately requires a multimeter and some familiarity with thermistor behavior. If the sensor or wiring needs replacement, working inside the outdoor unit involves electrical components and refrigerant lines, so a licensed HVAC technician is recommended for anything beyond a connector inspection.

If the fix is simply reseating a loose connector, there may be no parts cost, only a service call fee which typically ranges from $75 to $150. Replacing a faulty sub-cooling temperature sensor generally costs between $80 and $200 including parts and labor. If the outdoor control board is at fault, repair costs can range from $300 to $600 or more depending on the model and labor rates in your area.