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  1. #1
    Join Date
    Apr 2003
    Location
    Ohio Valley
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    28

    American Standard furnace problem

    American Standard, model: AUD140R960A1, s/n: H2650 8858
    Ignition Module: WR 50A51-405 (Trane pt CNT1308)

    Problem: Igniter was bad, yet WR gas valve opens during start up sequence and lets gas into the burners without igniter on. It will fire on the new igniter I installed. It completes heating cycle and shuts down as it should. No code on module except normal call for heat function. New one on me. Certainly this is not normal. Control should not open gas valve unless it has an igniter signal, right? Any help as to what to check is appreciated. Thanks, sonny

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  2. #2
    Join Date
    Feb 2008
    Location
    Waffleville
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    10,339
    i seen this once and ended up replacing the board. i think the new one is a "redo" design as well.
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  3. #3
    Join Date
    Feb 2007
    Location
    18951
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    1,593
    If your gas valve was staying open without the (old) ignitor ever glowing, then you have some problems, and should call a HVAC company right away.

  4. #4
    Join Date
    Feb 2008
    Location
    Everett, Wa.
    Posts
    88
    That control has no clue if the ignitor works or not, Yes it will open the gas valve but will shut down the gas valve in a couple of seconds if no flame is present. If Im thinking of the correct controller it will only give a code if it locks out.

  5. #5
    Join Date
    Aug 2007
    Location
    Northern VA 38 degrees N by 76 degrees W
    Posts
    5,060
    that is not abnormal the board does not know when the igniter has reached ignition temp, it then closes gas valve goes into a purge cycle and tries again up to three times before lock out.

  6. #6
    Join Date
    Apr 2004
    Location
    MN
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    1,801
    Is it the correct ignitor? Some ignitors take longer to reach ignition temp than others.
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  7. #7
    Join Date
    May 2007
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    somewhere between heaven and hell
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    957
    Quote Originally Posted by beachtech View Post
    i seen this once and ended up replacing the board. i think the new one is a "redo" design as well.
    Yep same here

  8. #8
    Join Date
    May 2007
    Location
    somewhere between heaven and hell
    Posts
    957
    Quote Originally Posted by doc havoc View Post
    Is it the correct ignitor? Some ignitors take longer to reach ignition temp than others.
    Another possibility

  9. #9
    Join Date
    Mar 2004
    Location
    Illinois
    Posts
    6,959
    Wrong forum for so much info.

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