Jim Katen Posted October 7, 2015 Report Share Posted October 7, 2015 Click to Enlarge 31.88 KB I was always interested in how heat pump thermostats are wired and I gained some insight today. For one thing, I've been wrong about the color codes. Apparently, they're as follows: B = Black O = Olive G = Gold Y = Yed W = Worange And it's good to know that the white wire isn't used. (No. The heat pump was not working properly.) My theories: The installer was colorblind. The installer was really stupid. The installer was really smart. This is what happens when pot becomes legal in your state. Link to comment Share on other sites More sharing options...
Rob Amaral Posted October 7, 2015 Report Share Posted October 7, 2015 "it never ends.. .." Link to comment Share on other sites More sharing options...
mjr6550 Posted October 8, 2015 Report Share Posted October 8, 2015 Hook up the brown wire and it will work fine. Link to comment Share on other sites More sharing options...
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