LG Air Conditioner Error Code 167

Error code 167 indicates that the subcooling inlet temperature sensor on the sub3 outdoor unit is reading as open or shorted. The control board cannot receive a valid temperature signal from this sensor, which disrupts normal system operation. The fault can stem from a loose connector, a failed sensor thermistor, or damaged wiring in the outdoor unit harness.

A power reset may temporarily clear the error and allow the unit to restart, but if the underlying sensor fault still exists, code 167 will return quickly. Resetting without repairing the root cause does not fix the problem. The sensor, connector, or wiring must be inspected and corrected to permanently resolve the fault.

If only the sensor connector needs reseating or cleaning, the cost may be limited to a service call fee, typically in the range of $75 to $150. Replacing the subcooling inlet temperature sensor itself generally adds parts costs in the range of $20 to $80 depending on the specific unit. If the control board is at fault, repair costs can rise to $200 to $600 or more including parts and labor.

A knowledgeable DIYer can start by checking that the sensor connector on the outdoor unit is fully plugged in and free of corrosion, which costs nothing to do. Testing the sensor's resistance with a multimeter is also within reach if you have basic electrical skills. However, replacing the sensor or diagnosing control board issues typically requires a trained technician, especially since the outdoor unit's refrigerant circuit is involved.

Running the system with an active sensor fault is not recommended. Without accurate subcooling temperature data, the control system cannot optimize refrigerant flow properly, which can reduce efficiency and potentially cause stress on compressor and refrigerant circuit components over time. It is best to address the fault before continuing normal operation.