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    lmattr30's Avatar
    lmattr30 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Aug 9, 2007, 02:18 PM
    10-15yr rheem
    Air or heat doesn't work. Fan blowes constently if left on at breaker. What could be the problem? 1 UNIT if I need to replace?
    acetc's Avatar
    acetc Posts: 1,004, Reputation: 79
    Ultra Member
    		  
    #2

    Aug 9, 2007, 02:47 PM
    When you lose the 24 volt control voltage (transformer) that's what will happen, the fan runs constantly. Check for a blown fuse on the printed circuit board in the furnace or air handler, if it is bad you may have a short in the thermostat wiring or a burnt control device. The fuse will be an automotive type. Look outside at the thermostat wires and see if they are bare or touching.
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