LG Freezer Error Code CO/--

The CO/-- code means the main PCB and the display PCB have lost communication for 30 or more consecutive seconds. This can happen because a connector in the wiring harness has come unplugged, a lead wire has been cut or damaged, or a transistor in the communication circuit on one of the boards has failed. The freezer will display this code until the communication link is restored.

A CO/-- error means the display and main control board are not communicating, which can impair the freezer's ability to properly regulate and display temperature. It is not recommended to rely on the appliance for long-term food storage while this error is active. Address the fault promptly to avoid potential food spoilage.

If the fix is simply reseating a connector, there may be no parts cost and minimal labor cost. Replacing a display PCB or case display assembly typically costs anywhere from $80 to $250 or more for the part, plus labor if you use a technician. Replacing the main PCB can range from $150 to $400 or more depending on the model and parts availability.

A knowledgeable DIYer can start by inspecting the wiring harness and connectors between the display PWB and the main PCB. If a connector is simply loose or unplugged, reseating it may resolve the error without any parts. If a wire is cut or a board is faulty, replacing the case display assembly or main PCB is required, which is a more involved repair.

A power reset may temporarily clear the code if the fault was caused by a momentary signal disruption, but it will return if the underlying cause is still present. If a connector is loose, a wire is damaged, or a PCB component has failed, the error will reappear until the physical issue is repaired. A reset alone is not a fix for this error.