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-   -   Goodman GDH8 lockout, Service Nightmare (https://www.askmehelpdesk.com/showthread.php?t=417629)

  • Nov 19, 2009, 07:45 PM
    Joshdta

    Yep with a little rubber tube going from it to the vent motor.
  • Nov 19, 2009, 07:49 PM
    mrsmoondog
    Ok, did that, turned it back on, and 1st cycle, nothing...
  • Nov 19, 2009, 07:51 PM
    mrsmoondog
    Dang. Didn't work.
  • Nov 19, 2009, 07:54 PM
    Joshdta

    Well that puts us back to gas pressure. Or the ignitor. But you say that it is one that goes threw the metal cabnet and can not be moved. And the control board timing. You could try to clean the burner orfice with a small wire on the burner closest to the ignitor.
  • Nov 19, 2009, 07:55 PM
    mrsmoondog

    Ok, I'll try and do that.

    And Josh? I really appreciate your trying to help.
  • Nov 19, 2009, 08:01 PM
    T-Top
    A small restriction inside the burner or orifice that set in front of the hot surface ignitor will keep the system from lighting.
  • Nov 19, 2009, 08:03 PM
    mrsmoondog

    Are the orifices inside the holes behind the ports? If so, I can't get to them as there is heavy wire mesh in the holes.
  • Nov 19, 2009, 08:07 PM
    Joshdta

    The orfice is the small brass plugs coming out of the main black gas line that sends gas down the metal tubes to the ignitor. They are on the gas manifold
  • Nov 19, 2009, 08:07 PM
    KC13
    The orifices are in the gas manifold that supplies fuel to the burners.
  • Nov 19, 2009, 08:13 PM
    mrsmoondog

    Ok found them. Gently poked a wire into them and turned the furnace back on. Waiting...
  • Nov 19, 2009, 08:14 PM
    mrsmoondog
    Nada... Guess I'd better get my electric blankets out.
  • Nov 19, 2009, 08:16 PM
    Joshdta

    Well the only other thing you could try, sense the tech is coming back tomorrow would be to turn up the gas pressure a bit. The tech thinks the probem is in the board?
  • Nov 19, 2009, 08:17 PM
    mrsmoondog

    I know he did check the gas; he said there is a small burnt spot on the back of the circuit board.
  • Nov 19, 2009, 08:18 PM
    Joshdta

    Well I guess you will just have to wait and see what he finds out. Let us know what it turns out being!
  • Nov 19, 2009, 08:19 PM
    mrsmoondog

    I will Josh, and thank you again!
  • Nov 20, 2009, 08:18 PM
    mrsmoondog

    Update: It wasn't the circuit board, and it's still not fixed. However it is back to firing sometimes again, so we do have sporadic heat. Daniel (the tech) adjusted the gas pressure up a bit, and is considering trying a new gas valve on it. However the valve does appear to be working...

    The only thing he can find that is a bit off is the amount of air it takes in before it fires. (Or attempts to fire.) He says he hasn't seen one draw as hard as this one does before.

    He is stumped, he says there is no reason that he can see that it isn't firing. (He also checked circuit board/pressure switch by bypassing the P/S as KC13 suggested, and that wasn't it either.) He says he will get to the bottom of it if he has to call Goodman to do so.

    Go Daniel!

    I'll update as we learn more.
    Have a great weekend!
  • Nov 20, 2009, 08:44 PM
    Joshdta

    Glad you got some heat.
  • Nov 20, 2009, 08:46 PM
    Joshdta
    What did he set the gas pressure at?
  • Nov 20, 2009, 09:00 PM
    mrsmoondog

    Not sure, said he bumped it up a little. He is going to swing by tomorrow and bump it up a little more to see if he can keep the dang thing running.
  • Nov 20, 2009, 09:11 PM
    hvac1000
    Here is a Goodman factory service manual for your unit.
    Your furnace trouble chart starts on page 28

    If you have not cleaned the flame sensor do so. Use steel wool or sandpaper. Many times cleaning it will not take on the first try so clean it again to be sure.

    If the light is blinking on a continuous basis then you have a case of polarity reversal. Reverse the 24 volt power leeds going to the board. This is a very common problem.

    http://www.alpinehomeair.com/related...st.%209.09.pdf

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