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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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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 drains...one 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


I WOULD CHECK THAT YOUR PVC PIPING IS SEALED PROPERLY.

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

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

Burner ignites and goes out (Goodman Gas-fired furnace)


Hi,
The problem you have is water in the exhaust pipe.
Check to see if the pipe has sagged anywhere or if there is a trap in the line.
If you hear gurgling then it is definetly water....
Some times can be hard to find, even a pipe 1/4 full will cause problems. They are very sensitive to flue problems.
Make sure that the flue pipe either runs back to the furnace or out to the outside, a continuos slope either way witha high spot in the middle.
Also check the bottom drain of the blower if it has one, have had them plug and trap water also..

I hope that this will help you to solve your problem!

Thanks for using Fixya!!

Heatman101

Dec 24, 2009 | Goodman GMS90703BXA Heater

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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