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Thread: Pilot go out

  1. #1
    Join Date
    Feb 2015
    Posts
    3

    Post Pilot go out

    Have a York gas furnace with an ignition spark and it is 22 years old. Problem is that the spark will lit the pilot and as soon as the spark quits, pilot goes out. Had to replace the spark module because it quit sparking. Put new one in and then it would spark and lit the pilot but when the it quit sparking and the pilot would go out. Replaced the spark module again, same results. Have also replaced the spark pilot unit, the spark wire and the gas valve. Also added a ground wire from pilot unit to the spark module. Need help

  2. #2
    Join Date
    Feb 2012
    Location
    Lala land, OH
    Posts
    235

    Default

    Have you replaced the thermocouple? If it doesn't have one, clean the flame sensor.

    Do you have a control board with a LED that's flashing out a code?

  3. #3
    Join Date
    Feb 2015
    Posts
    3

    Default Pilot go out

    Quote Originally Posted by Mr T View Post
    Have you replaced the thermocouple? If it doesn't have one, clean the flame sensor.

    Do you have a control board with a LED that's flashing out a code?

    It does not have a thermocouple and I put in a complete pilot unit which has pilot and spark sensor. Also it has a new spark wire, goes between control module and sensor. I have put in two different new control modules. Same results spark lights pilot, when turns off and the pilot goes out. Thanks.
    Noheat

  4. #4
    Join Date
    Feb 2012
    Location
    Lala land, OH
    Posts
    235

    Default

    Sounds like something is stopping the cycle.

    If you have a schematic or ladder diagram you can see what sensors/switches directly control the ignition process, otherwise you will need to go through the furnace. If one is tripped, you will need to figure out why it is and correct that issue.. (high limit reached, rollout, inducer airflow issue, etc)

    If your furnace has a board with a status/diagnostic LED it will help you alot. If it's flashing out a code, you can look it up and see what sensor/switch/system detected a problem.

  5. #5
    Join Date
    Feb 2015
    Posts
    3

    Default

    Thank you Mr T. I checked the furnace schematic and those switches are between the (W) terminal and the (24v) on the spark module. I place a wire there that by passed the switches and got the same results. Pilot went out as soon as the spark quit.
    Noheat

  6. #6
    Join Date
    Feb 2012
    Location
    Lala land, OH
    Posts
    235

    Default

    Probably time to call somone out. Could be something simple like a bent bracket or gas pressure, or you could have a case where one component is taking out another.

    Either way it's cheaper then randomly replacing stuff. Modern furnaces are not very DIY friendly.

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