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    Venn400's Avatar
    Venn400 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jun 29, 2008, 07:33 AM
    Connecting Honeywell RTH230B to ICM271
    I hooked up our new Honeywell RTH230B last fall and it worked fine, but now we get no ac when we turn to cooling. The fan comes on in the house, but the outside unit does not turn on. I can push the relay in (on the outside unit) and the cooling unit works as long as I have it held down. I have replaced the relay and the control board.
    The thermostat has:4 wires:Rh-Rc-W-Y-G with the reds being jumpered,
    The control board has:C-Y-Gc-Gh-R-W. C and W go to the relay outside, but no voltage is being sent to the relay. Do I just need to add a jumper between Gc and Gh? Thanks for any help
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jun 29, 2008, 10:52 AM
    Check this out

    Wiring diagram

    http://www.patriot-supply.com/files/icm_icm271-ag.pdf
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