Trane CNT2938 Defrost Board

The Trane CNT2938 is a defrost board specifically designed for Trane heat pump systems. A defrost board is an electronic control unit that controls the defrost cycle in a heat pump. The heat pump outdoor unit freezes up during cold weather frost on the brutal cutter can reduce the ability of the unit to absorb heat from outside air. The board detects frost buildup and triggers the defrost cycle. The typical cycle of this cycle begins by reversing the refrigerant flow or activating heating elements to melt frost. When the defrost cycle is complete, the board makes sure the heat pump resumes normal heating mode.