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    drager56's Avatar
    drager56 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Oct 27, 2009, 08:12 AM
    Limit or rollout open
    I have a ducane furnace model MPG075B3A. The gas valve is flashing 4 flashes the code is limit or rollout open. I cannot find my owners manual to find the location of these switches. Any help would be appreciated.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Oct 27, 2009, 11:52 AM
    Look on the inside of the blower access door for a wiring diagram.
    dstaudt09's Avatar
    dstaudt09 Posts: 1, Reputation: 1
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    #3

    Jan 10, 2010, 05:50 PM
    I have the same problem and I looked but still can't figure out how to manually open the limit switch
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #4

    Jan 10, 2010, 06:11 PM
    Is it a Honeywell smart(dumb) valve by any chance? Note you normally do not open the limit switch on newer furnaces. Post some pictures so we can see what you have.
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