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

    Jan 8, 2012, 11:44 AM
    What to do with the yellow wire on heat only thermostat?
    What do I connect the yellow wire too. It is saying I have an open circuit and the heating system shuts down for 3 hours
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
    Plumbing Expert
    		  
    #2

    Jan 8, 2012, 01:15 PM
    On a heat only system, the only terminals on the stat that are used are the R and W. What color wires are coming out the wall to the stat? And what wires are hooked to what terminals in the furnace? Is this a new stat, and if so, did the system work with the old stat? How was the old stat wired?
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