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

    Nov 11, 2007, 03:15 PM
    HoneyWell Thermostat Wiring RTH230
    Hi,

    I am trying to install a HoneyWell RTH230 programmable thermostat to replace our old Honeywell round thermostat. I have a Miller gas furnace and electrical central air. The wiring to the old thermostat was as follows:

    Red
    Orange
    White
    Yellow
    Green

    There were also blue and black wires coming out of the wall but not hooked up to the thermostat.

    I hooked up the new thermostat as follows:

    Red to Rh
    Orange to Rc
    Yellow to Y
    Green to G
    White to W

    And left the blue and the black ones unattached. The heat seems to be working fine but I cannot get the AC to come on? Any ideas?

    Thanks for your help.
    hixton's Avatar
    hixton Posts: 146, Reputation: 5
    Junior Member
    		  
    #2

    Nov 11, 2007, 07:18 PM
    Disconnect the orange and put a jumper between rh &rc you should be fine ac should work
    labman's Avatar
    labman Posts: 10,580, Reputation: 551
    Uber Member
    		  
    #3

    Nov 11, 2007, 07:35 PM
    If that doesn't work, check what the orange is connected to at the furnace. You may want to look at the sticky at https://www.askmehelpdesk.com/heatin...ons-58313.html
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