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    SHANNON72's Avatar
    SHANNON72 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Nov 20, 2007, 06:21 PM
    Wiring RTH230B Honeywell Thermostat
    I have 5 wires: red, blue, yellow, white, and green. I have wired the yellow, white and green to the appropriate codes. What do I do with the red and blue wires? Please help!!
    biggsie's Avatar
    biggsie Posts: 1,267, Reputation: 125
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    #2

    Nov 20, 2007, 08:38 PM
    This is the diagram for your thermostat ( RED to RH ) (BLUE to RC)

    http://customer.honeywell.com/techli...0s/69-1800.pdf

    Add this to your favorites so you can trace wiring if needed

    2.3.5 ----- 4-wire Heating and Cooling

    2.3.6 ----- 5-wire Heating and Cooling
    labman's Avatar
    labman Posts: 10,580, Reputation: 551
    Uber Member
    		  
    #3

    Nov 20, 2007, 09:41 PM
    The blue will go to RC only if it is a separate hot for cooling. More likely it is an unneeded common. Usually you jumper red to both RC and RH. You can check at the furnace and see if the blue comes off a com terminal.
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