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rwiens

03:42PM | 11/17/03
Member Since: 08/13/01
13 lifetime posts
Bvhvac
I woke up the other morning to a freezing cold house and subsequently discovered water in the bottom of the furnace. I mopped it up and dried out the ignition parts with a hair drier and it worked fine.

Since then, I have noticed water a few more times, most obviously at the joint between the furnace and the hot air plenum.

The question is...where is the water coming from? I thought it might be running down the flue, so I had a look and sure enough there is a 1/8" gap between the flashing and the flue as it exits the chimney so I caulked it. But why hasn't this been a problem before?

Also, the flue is actually connected to the furnace below where I saw the water, so it didn't really make sense that the water was running down the flue.

While I'm at it, my furnace does not seem to have any sort of connection to the outside for combustion air (it is about 18 years old). Is it possible that the gap I caulked was to draw combustion air down the chimney between the liner and the flue?

beaver

06:11PM | 09/16/06
Member Since: 09/15/06
1 lifetime posts
Just discovered the same problem today in a gas furnace. What causes the water buildup?

bombpop

07:39PM | 06/17/07
Member Since: 06/16/07
1 lifetime posts
I have water in the bottom of the furnace and the air is not getting cold.
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