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    thom k's Avatar
    thom k Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Nov 11, 2008, 06:25 PM
    Heating and air conditing
    Carrier 58ssb.we replaced control brd,sensor,ignitoin modul,and still doing the same .pilot ignit but main valve doesn't open up.all safety OK,wire harness OK.I have only 8 volt going 2 main valve.
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
    Plumbing Expert
    		  
    #2

    Nov 11, 2008, 07:04 PM

    Need roughly 24v to main valve to open. The money you have spent replacing parts could have easily paid for a pro to come fix your problem. Have you checked pressure swithces? Need to find why you are not getting proper voltage at gas valve.
    thom k's Avatar
    thom k Posts: 2, Reputation: 1
    New Member
    		  
    #3

    Nov 11, 2008, 08:27 PM

    I did by pass it.its weird ,ground is good,checked every thing all seems to be OK but I am not getting 24 v 2 main valve.
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
    Uber Member
    		  
    #4

    Nov 11, 2008, 09:08 PM

    Take the wires off the main valve and measure the voltages during the pilot and main valve phase.
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