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    ed5612's Avatar
    ed5612 Posts: 3, Reputation: 1
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    #1

    Nov 29, 2008, 02:03 PM
    Heating unit won't come on every time we turn it on.
    I have a Day and Night unit that's about a 1979 model the model # is 585A030080YACR the problem is when I turn it on the ignitor sparks but it won't open the pilot gas valve
    Other times it works great, not sure if I need a thermostat or ignitor or if it's the gas box
    Please help!



    Thanks ed5612
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #2

    Nov 29, 2008, 02:29 PM
    Quote Originally Posted by ed5612 View Post
    I have a Day and Night unit thats about a 1979 modle the modle # is 585A030080YACR the problem is when I turn it on the ignitor sparks but it won't open the pilot gas valve
    other times it works great, not sure if I need a thermostat or ignitor or if its the gas box
    please help!



    Thanks ed5612
    That unit might have a 3 wire pilot/safety control. They can and do cause problems.


    Does it look like this.
    Attached Images
     
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    ed5612 Posts: 3, Reputation: 1
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    #3

    Nov 29, 2008, 05:07 PM
    Yes it looks just like that!
    ed5612's Avatar
    ed5612 Posts: 3, Reputation: 1
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    #4

    Nov 29, 2008, 05:09 PM
    Quote Originally Posted by hvac1000 View Post
    That unit might have a 3 wire pilot/safety control. They can and do cause problems.


    Does it look like this.
    Yes it looks just like it!
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #5

    Nov 29, 2008, 05:26 PM
    Then check it with a meter to see if it is good or replace it. This is usually the problem but I cannot test it for you,
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