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  1. #1
    Join Date
    Nov 2019
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    Question York D4CG036N08225B Heating unit issue

    Hi all,

    I hope I can get some help. I received a service call for a unit in which the heat is not working. I checked it out and there was no spark and there was 24 volts coming to the ignition module (TH terminal). S1-325-42681-000.

    I replaced the ignition model to a new one (OEM). Then the system turned on and the heat was working and I left. But the second day the owner called saying there's no heat. I checked and the spark is coming but the gas valve is not opening even though there is 24 volts on the ignition module terminal (MV and PV). So I lifted the gas valve terminal PV and touched it with the wire from the gas valve so the gas started and the burners turned on and everything worked, including the heat. So I felt that maybe the current is not coming properly and I decided to replace the roll out switch. But I didn't have it in stock so I left the unit while it was running.

    The third day I came with the roll out switch and high limit switches and replaced them but there was no spark even though there was 24 volts coming on the ignition module TH terminal. Ignition module is new. I don't know what the problem is since everything is working. I am guessing that the ignition module is bad or maybe the gas valve magnetic coil is going bad and is giving backpower to the ignition module and short circuiting the ignition module. (I am an experienced winder).

    I will check tomorrow with a new ignition module and gas valve. This is the first time this has happened even though the burners are totally clean. The air circulation filter has been checked too.

    Has anyone else experienced this problem where the ignition module goes bad because of the bad gas valve (magnetic coil), short circuit or something else?

    Thanks

  2. #2
    Join Date
    Oct 2011
    Location
    Chicagoland Area
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    Are you checking your voltage to common or ground?
    Officially, Down for the count

    YOU HAVE TO GET OFF YOUR ASS TO GET ON YOUR FEET

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  3. #3
    Join Date
    Mar 2019
    Location
    Milwaukee
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    does it spark every time now?
    Last edited by Bdevries; 11-10-2019 at 11:59 PM. Reason: Read reply wrong

  4. #4
    Join Date
    Nov 2019
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    Thread Starter
    Quote Originally Posted by 2sac View Post
    Are you checking your voltage to common or ground?
    Thanks for responding. I checked 24 ground to TH and 24 volt ground to roll out switch. Both are showing 24 voltage but no spark. So today I replaced the ignition module to new and the heat started but after two or three tries. I will see in how it runs in the next few days.

  5. #5
    Join Date
    Nov 2019
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    Thread Starter
    Quote Originally Posted by Bdevries View Post
    does it spark every time now?
    Thanks for responding. No it doesn't spark at all. But the 24 voltage is coming to TH and roll out with the ground and neutral. I replaced the ignition module and after two/three tries it fired up. So let's see how it works in the next few days.

  6. #6
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    31,695
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    We can't be too specific in the open forums.

    For future help, get 15 substantive posts and apply for the free Pro membership by using the link in the bottom of my signature area.

    In the pro section we really pick this stuff apart.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist
    Member, IAEI

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  7. #7
    Join Date
    Mar 2005
    Posts
    61
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    Sounds like dirty contact in limit switch causing a voltage drop that only occurs under a load

  8. #8
    Join Date
    Nov 2006
    Location
    Southeastern Pa
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    Quote Originally Posted by stopro1 View Post
    Sounds like dirty contact in limit switch causing a voltage drop that only occurs under a load
    In this model, there are a half dozen or so potential issues that are typical to the beast.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist
    Member, IAEI

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