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DEFROST Control Board Wire Terminal Functions! Heat Pump Defrost Cycle Explanation!
This HVAC Video is about how the Heat Pump Defrost Control Board Works and the basic function of the wire terminals connected onto the control board. I go over what is happening during defrost, how and why defrost starts, and how to trick the system into defrost as well as ending defrost. I go over what is happening with each of the components connected on the defrost board and if these pressure and temperature sensors are normally open or closed as well as other tips!
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