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    Ravenna-Carrier's Avatar
    Ravenna-Carrier Posts: 4, Reputation: 1
    New Member
    		  
    #1

    Dec 26, 2007, 09:34 AM
    Carrier furnace irradict operation
    May I ask what a main limit switch is and what it's purpose is? I have a 150,000 BTU sparker igniting furnace model 58GS150-1A (Carrier) Series 101.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Dec 26, 2007, 12:47 PM
    Main limit is a safety device.
    Its purpose is to help the furnace from going into terminal meltdown.
    In other words it is a very important part and if you have a bad one you need to find out what the problem is and then replace the high limit.
    Dirty filters and A/C coils can cause this as well as other things.
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