The York S1-33109150001 Control Board Kit Simplicity 2-Stage is an HVAC control component designed to manage and regulate the operation of compatible York heating and cooling equipment. It functions by processing system inputs and coordinating two-stage operation to help maintain comfortable indoor temperatures while optimizing equipment performance. Commonly used in compatible HVAC r... https://www.partshnc.com/york-s1-33109150001-control-board-kit-simplicity-2-stage