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    claycook1's Avatar
    claycook1 Posts: 1, Reputation: 1
    New Member
     
    #1

    Dec 23, 2012, 12:04 PM
    Honeywell rth2300b wiring
    Replaced old thermostat with rth2300b. Everything works OK except no heat. Fan comes on but the air isn't warm. 4 wires come out of the wall to the control unit:
    Red wire missing a label
    White wire labeled O
    Green wire labeled G
    Yellow wire labeled Y

    Terminals on unit are labeled:
    B, O, G, Y, W
    R and RC are jumpered together

    Anybody know what I need to change to get the heat on?
    I've tried the red wire on R/RC and W.
    Thanks,
    Micah
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
    Plumbing Expert
     
    #2

    Dec 23, 2012, 03:38 PM
    Red to R. White to W. Green to G. Yellow to Y. Leave the jumper between R and RC in place. Give that a try and let me know how things work out. If this fails to work, you will need to look in the furnace and let me know what wires hook to what terminals there.

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