Original used part that is in working condition. It was in stock for a few years it has less use on it. The board is refurbished and if you have any issue with my board you can send it back for the repair. It all depends how you want to keep your old Carrier working. I believe in old appliances quality build. It is takes some knowledge and understanding to install that board as there is lots of connections with some low and hi voltage. This board was powered and tested for basic operations.