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Posted on Nov 01, 2009
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Installing thermostat - extra wire?

Installing a honeywell programmable thermostat. My home has 6 wires (white, yellow, orange, red, green and blue) but the thermostat only has 5 (Rh, Rc, W, Y, G). I put the red in Rh, blue in Rc, white in W, yellow in Y and green in G. I left orange unconnected. What is the proper wiring?

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  • Posted on Nov 01, 2009
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Joined: Oct 15, 2009
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You have to go down to your furnace and follow the thermostat wire ...it connects to a terminal strip or fan centre...the color doesn;t really matter...installers mix and match all the time....look at the furnace wiring and mark it down...Red on "R"...Green on "Y" whatever it is...and connect it accordingly upstairs...if you only have 4 thermostat wires downstairs you will need a jumper wire between RH and RC...if you have 5 wires you will see 2 wires on "R" at the furnace.,...and connect either to RH and RC at the thermostat
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