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    Alfred Ament's Avatar
    Alfred Ament Posts: 19, Reputation: 1
    New Member
    		  
    #1

    Jun 22, 2008, 09:45 AM
    Pilotlight on 90% eff.furnace ?Tempstar
    My 18 year old 75 BTU Tempstar furnace the Gas valve has three wires .

    One ,to open the pilotgasvalve and two to open the main gasvalve!
    I am not getting a pilotlight gas! Or lit one !

    How to you check for voltage (24 V) on that incoming wire ?with my volt meter !

    Should I replace the Burnerpilot/ignitor/sensor ?at same time ?

    Will someone explain the function of the Pressure switch on that unit !

    Tempstar sears model 867-769426
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jun 22, 2008, 03:30 PM
    First remove and check your pilot orifice. It could be plugged up not allowing gas to pass through so the pilot will not light.
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