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  1. #1

    Confused Goodman GCH95 won't ignite

    Help help help! I installed a Goodman GCH95 95% nat gas furnace for my mom last fall. Somewhere around last april she complained it wasn't keeping house warm and took a video of furnace. It was lighting when tstat called but would go out and relight and repeat. I checked system and found that it would not stay lit after several heat cycles. At that time (april) I found the gas valve wasn't opening everytime it tried to light and replaced the gas valve under warranty. Now (today) I found that it would light for a few cycles and then not at all. Tstat calls, idm starts, ignitor glows, gas valve energizes - and then ignitor drops out without reading any gas pressure on gas gauge. I took a lunch break and came back and same thing - it lit a few times then I can't get it to do anything other than the sequence aboove. Does anyone have a recommendation as what to do next. I jumped all safeties one by one and ohmed all out. I'm thinking maybe control board. I cleaned flame sensor and pulled orifices. All ok. Please help...driving me nuts!!!

    Thanks,
    Erik

  2. #2
    Join Date
    Aug 2009
    Location
    Michigan
    Posts
    88
    I dont know how much technical information we are allowed to give in "tech-to-tech". Bottom line, you need to find out where your 24v is dropping out. Is it energizing the gas valve (use your metter, not your monometter)? or dropping out at a pressure switch, ect...

  3. #3
    The gas valve is getting 24v but the heat cycle is interupted when the valve doesn't open.

  4. #4
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,189
    If you've confirmed good gas supply, sounds like a bad valve.

  5. #5
    Quote Originally Posted by BaldLoonie View Post
    If you've confirmed good gas supply, sounds like a bad valve.
    Yea I know. That's what I thought originally and installed a new one under the warranty. But...here I am with new valve and same problem.

  6. #6

    Goodman GCH95 won't ignite

    I'm new to site and posted same question in other forum. Sorry, here is my question again.

    Help help help! I installed a Goodman GCH95 95% nat gas furnace for my mom last fall. Somewhere around last april she complained it wasn't keeping house warm and took a video of furnace. It was lighting when tstat called but would go out and relight and repeat. I checked system and found that it would not stay lit after several heat cycles. At that time (april) I found the gas valve wasn't opening everytime it tried to light and replaced the gas valve under warranty. Now (today) I found that it would light for a few cycles and then not at all. Tstat calls, idm starts, ignitor glows, gas valve energizes - and then ignitor drops out without reading any gas pressure on gas gauge. I took a lunch break and came back and same thing - it lit a few times then I can't get it to do anything other than the sequence aboove. Does anyone have a recommendation as what to do next. I jumped all safeties one by one and ohmed all out. I'm thinking maybe control board. I cleaned flame sensor and pulled orifices. All ok. Please help...driving me nuts!!!

    Thanks,
    Erik

  7. #7
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    18,592
    Let me get this straight.

    You said the gas valve IS being energized, and you are not registering gas pressure at the manifold?
    [Avatar photo from a Florida training accident. Everyone walked away.]
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  8. #8
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,123
    Merged your threads.
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    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  9. #9
    Quote Originally Posted by timebuilder View Post
    Let me get this straight.

    You said the gas valve IS being energized, and you are not registering gas pressure at the manifold?
    That's correct. 24v is sent to valve but after 1-2 seconds the ignitor is de-energized and the heat sequence starts again with same result.

  10. #10
    Join Date
    Sep 2002
    Location
    Northeast Ohio
    Posts
    4,842
    Have you consulted Goodman Tech Support?
    A good HVAC tech knows how, an educated HVAC tech knows why!

    DEM


  11. #11
    Join Date
    Jan 2011
    Location
    greenville , sc
    Posts
    718
    Quote Originally Posted by Saltysakz View Post
    The gas valve is getting 24v but the heat cycle is interupted when the valve doesn't open.
    I'm gonna say no, the gas valve is fine and its a voltage / proving problem.

    Check the flue , then PS then , the stat, then the wiring to and from the control circuit
    Then you should make a 5 min you tube vid of the problem (include ductwork , flue piping , and video of at least 5 bad start-ups.) Post it then we can review.... the reason I say this is your troubleshooting
    Technique isn't so obvious to me and I'm stumped until I get a look see.......................

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