LG Air Conditioner Error Code 130

Error code 130 on an LG air conditioner indicates that the Sub2 outdoor unit air temperature sensor has been detected as either open (broken circuit) or shorted (unintended electrical contact) in a three-unit system. This sensor provides ambient outdoor temperature data to the control board for compressor and defrost management. The system logs this code and may restrict operation until the sensor fault is resolved. Diagnosing the issue starts with checking the sensor wiring connections and measuring sensor resistance.

Running the system with error code 130 active is not recommended. Without accurate Sub2 outdoor air temperature data, the control board cannot properly manage compressor operation or defrost cycles, which can lead to inefficient performance or potential equipment damage over time. In many cases the system will restrict or shut down operation automatically when this fault is present. It is best to address the sensor fault before resuming normal use.

Resetting the unit by cycling power may temporarily clear the error code display, but the code will return if the underlying sensor fault has not been corrected. A reset does not repair broken wiring, a failed thermistor, or a faulty connector. Proper diagnosis using a multimeter to check sensor resistance and a visual inspection of the wiring harness is necessary to confirm the fault is actually resolved before relying on the system for normal operation.

Some causes of error code 130, such as a loose or dislodged sensor connector, can be corrected by a knowledgeable homeowner after safely powering down the unit and reseating the connector. However, measuring thermistor resistance, tracing wiring faults, and replacing components in a multi-unit outdoor system typically requires familiarity with HVAC electrical systems and a multimeter. If you are not comfortable working with outdoor unit wiring, a certified HVAC technician should perform the diagnosis and repair.

Repair costs depend on the root cause. If only a connector needs reseating, labor charges may be minimal, typically in the range of $75 to $150 for a service call. A replacement outdoor air temperature sensor generally costs between $20 and $80 in parts, with total repair costs ranging from $100 to $250 including labor. If the outdoor control board has failed, parts and labor costs can range from $300 to $600 or more depending on the unit model and local labor rates.