“My thermostat with aux heat has a separate W and O/B terminals. You have one for both W-O/B on your rth9585. Do I wire both my W and O/B with together? (I have the orange wire)”
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You hook it up in the exact same way as it was hooked up to the original. I had this issue. When you program the thermestat, it will ask you if you have aux heat. If you program it incorrectly, when the ac comes on, it will blow heat Instead of cold. If this happens, simply change the program settings.
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