Field Controls 602609900 CK-63 Circuit Board Kit is an electronic control assembly designed to manage and coordinate the operation of venting and combustion system components in compatible HVAC equipment. It works by processing system inputs and controlling connected devices to ensure proper sequencing, monitoring, and safe operation. This circuit board kit is commonly used in furnace... https://www.partshnc.com/602609900-field-controls-ck-63-circuit-board-kit