LG Air Conditioner Error Code E323

E323 indicates a fault on the Suction Sensor 2, which monitors refrigerant temperature on the suction side of the system. The control board has detected either a short circuit or an open circuit condition from this sensor. The unit will not operate normally until the sensor signal is restored to an acceptable range.

A reset may temporarily clear the E323 code, but if the underlying sensor fault still exists, the error will return quickly once the unit attempts to operate. Resetting without fixing the root cause does not resolve the problem and may delay proper diagnosis. The sensor, wiring, and connector should be inspected and tested before relying on a reset.

If the fix is simply reseating a loose connector, there may be no parts cost and only a minimal service call fee. Replacing a failed suction sensor typically costs between $50 and $150 for the part, plus labor. If the control board requires replacement, costs can range from $150 to $400 or more depending on the model and labor rates in your area.

A homeowner can safely check whether the sensor connector has come loose and reseat it, which resolves the fault in some cases. However, measuring sensor resistance, tracing wiring faults, and replacing components inside the unit typically requires tools and familiarity with refrigeration electronics. If reseating the connector does not clear the code, a qualified technician should perform further diagnosis.

The unit typically shuts down or restricts operation when E323 is active specifically to protect the compressor and refrigerant circuit from running without accurate suction temperature data. Attempting to force the system to run through repeated resets without correcting the fault risks compressor damage. It is best to leave the unit off until the sensor fault is diagnosed and repaired.