Question about Honeywell Programmable Thermostat Heater

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Heating and Cooling Thermostat - can't get the wires right

Hi All,

Hope you can help me on this one. I have a honeywell programmable thermostat. Coming from my wall I have: a red, white, black, green and orange wire. In the winter, I successfully made the heater work by hooking up the red to the Rh input, had a jumper connecting to the Rc input and hooked up the white wire to the W. The black wire did not connect anything. The green and orange wires were buried and not used in the prior connection (the prior thermostat was an old-school dial-type). I turned on the AC this summer and could not get it to work. I have made the AC unit and blower kick on by manually touching the black and white wires. I can't seem to make the thermostat kick on the AC, though, having tried quite a few combinations. I have done all of the normal troubleshooting stuff - have narrowed it down to my incorrect wiring. I have Rc, Rh, W, Y and G inputs into the thermostat.

Help me make the right connections! Thanks everyone!

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You most likely do not have AC.
Red to R (24volts), White to W(heat).

Black(usually common), Orange(usually reversing valve for a heat pump, could be anything you want it to be as long as you wire it on both ends correctly), and Green (usually FAN) were buried, so they were never used.

Posted on Jul 23, 2009

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Depending on if you have gas or oil heat the connections would be slightly different, but if you were only using the red, white, and black before, this should work. Red to Rc with jumper to Rh (or vise versa..) White to white, and Black to your Y terminal. Your Rc and Rh terminals are your 24 v supply, Yellow is connected to your outdoor unit, and W is the common for the heat, and G is for you high speed fan. Hope this helps

Posted on Jul 09, 2009

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