Question about Goodman GMS90703BXA Heater

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Condensation running down old vent pipe running to roof.

Vent pipe from old furnace was left in and the new PVC pipe has been run up through it . We are getting condensation running down the old metal vent pipe and can't seem to stop it.

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  • dwkcool May 11, 2010

    sound like the pvc was not ran out far enough and making condensation in the old metal pipe

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This is a condensing furnace and is ment to condense. You will need to pipe away the condensate using a hose and maybe a condensation pump. It is unclear where the combustion air pipe is going? Are you using room air? or do you have a second pipe going up the old vent as well?

Posted on Jan 06, 2009

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Posted on Jan 02, 2017

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New goodman 80% gas furnace leaking condesation down exhaust vent


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My high efficiency furnace has water (possibly condensation) running down the air intake pvc pipe into the furnace and all over the burner, gas valve, and wiring.


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I have a American Standard furnace Freedom 80 Mod# AUD080C936H3 and am looking for a manal or can you tell me how the exauhst is done. Can I use PVC


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We have a Goodman GSK9 gas furnace. There is a weep hole on the PVC outside of the house, that in the winter develops a vry large icicle against the house and has damaged our wood siding. When we plugged...


Hello Jmranes,
It sound to me like your getting alot of condensation on your exhuast pipe and a weep hole was drilled to "BAND AID" the issue. These is not how 90% plus furnaces are installed. If you are referring to the outside intake and exhaust PVC piping, then there shouldn't be any weep holes. When the furnace is properly installed, the furnace comes with a condensate kit (refer to owners manual) that is mounted on the side of the furnace and all the condensation that collects overflows and should be piped directly into a floor drain. As for the intake and Exhaust for side discharge application, the Exhaust PVC pipe should come out through the side of house and immediate goose neck up (90 degree) with a straight piece of PVC pipe about 2' to 3' or so in length, then a final 90 degree PVC fitting on that so the exhaust blows out. As for the intake, that also comes out the side of the house about 2" to 3" inches parallel to the Exhaust but should only be a 90 degree PVC fitting facing down. The idea here is making sure the furnace doesn't suck in exhaust air. Also, making sure proper size pipe was used. Both outside pipes should be open to atmosphere. I hope this helps.

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The Btu rating for this furnace is 40,000. Since the furnace has a 3 /34" metal flue collar on the top of the unit, you can not use PVC pipe to vent it. Only 90+ efficient gas furnaces can use PVC pipe for venting and the also come equipped with a condensation pump, which yours doesn't.

For more information on your furnace and how it's to be safely installed and vented, here is a link to the installation manual http://www.greenwoodheating.com/products/manuals/gasfurnaces/G40UH.pdf that you can download and print.

Hope this helped answer your questions?

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1 Answer

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Hope this helps you.

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1 Answer

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Is the vent suppose to be pvc 2" or metal 2 wall thru roof on fasco blower


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Heat not coming on carrier gas pack code 31


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1 Answer

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