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    Cara945's Avatar
    Cara945 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jan 8, 2008, 08:32 PM
    indicator = pressure switch or auxiliary limit stuck opn
    I have a concord 80% efficiency furnace. The fan comes on occasionally but will not stay on for more than a minute. The diagnostic light is flashing a series of 3 lights which indicates a pressure switch or auxiliary limit is stuck open -- how do I find these switches and 'close' them?
    Frdbrkl's Avatar
    Frdbrkl Posts: 94, Reputation: 7
    Junior Member
    		  
    #2

    Jan 9, 2008, 04:20 PM
    Try changing your filter first, and see what happens. If you've already changed the filter, contact a licensed tech. These are both safeties and should be looked at by a licensed trained mechanic, as an unsafe condition exists and the safeties are preventing operation.
    acetc's Avatar
    acetc Posts: 1,004, Reputation: 79
    Ultra Member
    		  
    #3

    Jan 9, 2008, 04:33 PM
    Try turning on the fan at the thermostat to determine if the problem is with the fan motor or a control part, with the fan running turn on the heat and see what happens, Good luck, Mike
    lachoy's Avatar
    lachoy Posts: 2, Reputation: 1
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    #4

    Jan 28, 2008, 04:00 PM
    I have a coleman electric heater where is the limit switch located just installed last feb
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