Manufacturer Name: Trane Product Number: CNT8175 OEM Part Number: CNT8175 The Trane CNT8175 Defrost Control Board is a critical component in heat pump systems, designed to optimize defrost cycles for efficient operation in cold weather. It monitors outdoor temperature and system operation to initiate defrost only when necessary, reducing energy consumption and maintaining comfort... https://www.partshnc.com/cnt8175-trane-defrost-control-board