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My goodman gas furnace is leaking water at the bottom of where the pvc piping comes out of the unit from the top of the unit. its the exhaust pvc piping. how can i repair this? can i just put pvc glue or some type of seal glue to stop the water from coming out?

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You need to clean the pvc, prime it and reglue it and this should take care of your problem

Posted on Jan 21, 2009


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Posted on Jan 02, 2017


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Theres a thin metal pipe hanging from ceiling & hovers over a funnel top pvc pipe. There are drk green & brown dry splashes on the pvc pipe. Drain pipe has a strong mildew smell but idk what pipes for

Hi LaTrice:
Tankless water heaters are essentially little gas fired furnaces that heat water, not air. When natural gas burns, a by-product of the combustion is water vapour. Since the furnaces are very efficient, the exhaust gas temperatures are relatively low, and as they go out the duct, they drop even more and the water vapour present condenses and runs back down to a capture device so that it does not dribble all over your floor.
This drain pipe is supposed to go to your sewer (or building drain) and is also supposed to be protected by a TRAP that needs to have a minimal amount of water present to prevent sewer gases from coming back into the room. In hot dry weather, these traps can dry out as there is not as much condensation present.
It could be that when the unit was installed, it was connected by way of a trap that did not have a means of staying primed.
Hope this helps.
RBO (Retired)

Jul 28, 2015 | Rinnai Water Heaters

2 Answers

Why is water coming out of my furnace exhaust pipe?

When natural gas or propane burns, water vapor is given off within the flu gasses so a bit of condensation in, off and around the flu discharge is quite normal. If it is a high efficiency furnace with the pvc flu pipe, they must be pitched properly BACK TO the furnace so the moisture will drain backwards and out a drain tap at the bottom of the riser. That style of furnace will have TWO up high for the air conditioner coil and one about 16" up from the bottom of the furnace off of the 'condensing coil' that the flue gasses pass through to extract a much greater amount of heat from the burned gas.

Many flu pipes are installed incorrectly which causes water to drip outside instead of back to the furnace and this usually results in huge icicles hanging off of them in the winter and eventually the partial blockage causes the flu's pressure switch to open.

If you have regular galvanized flu pipe, you have less than a 90% high efficiency furnace and the resultant flu gas temperature is much higher with a much greater quantity of water vapor in it. A little condensation is somewhat normal on the top of the flu cap as the hot moisture laden vapor comes in contact with the cold and dry outside air. If the moisture is all over the galvanized flu pipe in the basement, you are possibly venting into an oversized and unlined masonry chimney. IF that's the case, the chimney should really be lined with a flexible liner and properly connected to the furnace and water heater (if gas fired) with the proper connections and configuration.

Mar 25, 2015 | Heating & Cooling

1 Answer

Condensation water drips from top of unit


Feb 22, 2015 | Goodman Manufacturing GMVC951155DX 95%...

1 Answer

New goodman 80% gas furnace leaking condesation down exhaust vent

it could be condensation. or poor seal at roof. probably the seal at roof. also check the larger copper line is it sealed good? if any spot is not this will cause leaking when in cooling mode. maybe dripping from line onto vent.

Jan 28, 2014 | Goodman Manufacturing Goodman 60,000 btu...

1 Answer

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.

First, check the drainline from the furnace. You have a 90% gas fired furnace. Where 80% furnace has 1 heat exchanger, yours has 2 heat exchangers. And the second heat exchanger will cool the exhaust enough, that it ends up below the dew point, and your furnace outlet/exhaust will condensate. This drain is probably stopped up. Now, I've installed and service many of these systems and I've only seen the piping at the roof you described once. And that was when the roofers replaced the roof, damaged the furnace flue pipe, and tried to repair it themselves. Normally, and this may not apply to yours, we tie in the exhaust/supply lines about 2-3 ft. above the furnace. Then 1 pipe goes through the roof. Thus 1 pipe is a kit that has an inner liner & outer pipe(2 pipes in 1). Now I'm not sure if this is a problem or normal for your system, but it may be worth looking into. You should be able to find it in the installation manual, or call a local parts house that sells your brand, or as your tech. And if it's just your drain, forget all about the piping I mentioned. Hope this helps!

Mar 08, 2017 | Goodman Heating & Cooling

1 Answer

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.

Nov 12, 2017 | Goodman Heating & Cooling

1 Answer

Dont have a book to tell me how to install heat exhaust pvc or tin

most furnaces require 4 inch vent pipe to be installed ... you can use pvc as long as it is rated for the temperature... there should be an obvious hole in the furnace where the enducer draft motor pushes the exhaust... if this is a upflow unit in the closet you will need to connect to the bell housing of the exhaust and start running your pipe up and out side .you will need double wall pipe rated for heat and or rated pvc if installing pvc... once outside make sure if on rood you have a roof jack for pipe to go through and a collar around pipe to keep water from running down and then a cap on pipe ....if it is a horizontal unit done the same way except your already in attic and don't have a as far to go it can run vertical and horizontal try to minimize your 90 degree turns and is best to keep it angled to prevent moisture from buiding up in pipe...

Jan 25, 2011 | Goodman Heating & Cooling

1 Answer

My furnace is leaking water when the heat is running

You probably have a 90+% efficient furnace. They produce condensation. Does it have PVC vent pipes? If so there is a drain tube for condensation.

Jan 23, 2009 | Heating & Cooling

1 Answer

Goodman furnace leaking water

Yes you can use regular pvc glue. You should use pvc primer before you glue it.

Jan 21, 2009 | Goodman GMS90703BXA Heater

5 Answers

Ignitor glows, but no gas

Most likely either a bad board or no gas to gas valve. Bleed out all air in the gas line. Check for 24 volts at both gas valve and circuit board terminals leading to gas valve. No voltage = bad board.

Jul 23, 2008 | Goodman GMS90703BXA Heater

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