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Hoping to get some help with this. The current old thermostat has a R (red wire) ,G (black wire, switches to blue at the furnace end) , and W (white wire). I noticed at the furnace side the white wire was connected to both the W1 and W2 terminal. When i called Emerson they said i would need a "C" wire to make it work despite them advertising it as not needing a "C" wire. When i plug in the 3 connection points (R,W,G) into the Sensi APP, it comes back as invalid connection point. However, if i add that it has W1, W2 (since the white wire is connected to both those terminals, it comes back as compatible (R,G,W1,W2). So what I'm thinking is I connect the R (old) -> RH (new), the G (old) -> G (new), and the W (old) -> W/E (new), and daisy chain (jump) the W/E to the W2 on the back of the Sensi. Any info on whether this will work would be appreciated. Or any other tips to getting it to work. Its a heat only system. I have provided some pics. Thanks

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    Hello, and welcome to Stack Exchange. Looks like two of your pictures didn't work; post the URLs of them and someone will be along to edit them into your question. – Daniel Griscom Oct 28 '16 at 2:01
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    What sort of furnace are you controlling, and do you care about being able to control the fan separately from the heat? – ThreePhaseEel Oct 28 '16 at 2:10
  • What did your old thermostat control (heat and blower, cooler, etc)? BTW, Emerson says quite clearly that it will operate on its internal battery if no C wire, but will not support wifi. I found it just as easy to buy a DC power supply and "hot-wire" power to the Emerson thermostat as is clearly explained in the installation manual – Carl Witthoft Oct 28 '16 at 12:25

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