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

    Jan 7, 2010, 07:58 PM
    I have a GMP 100-3 furnace and the circuit board indicates main limit switch.
    I have tried to jump the temperature limit switches and still nothing. The blower runs constantly and exhaust fan runs constantly. Any suggestions?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jan 7, 2010, 08:37 PM
    Here is a complete factory service manual for your furnace. It is also for a few other models so make sure the info you use out of the manual is for your model number,

    http://www.hvacpartsshop.com/Gmph075-4%20Series.Pdf
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