I think that's condensation, and the higher flow when the unit...

...shut off would seem to indicate that as well. The condensate drain is usually in a negative pressure zone where it attaches to the air handler, so it's not unusual to see condensate collect in the drain line and get "held" there until the air handler fan turns off and the pressure in the pipe reaches equilibrium with the atmospheric pressure outside. The obvious question is where is that water usually supposed to go, and why was it leaking out of the unit this time? Is there a drain line visible?

But clearly I'm not an HVAC tech, so take this with a grain of salt.
[Post edited by MP4VT2004 at 01/22/2019 2:08PM]

In response to this post by Late 80s Hokie

Posted: 01/22/2019 at 2:01PM

Any theories on why my gas forced air furnace was leaking water? -- Late 80s Hokie 01/22/2019 12:54PM

You should see a GI doctor. Forced gas with leakage is never a good sign. ** -- HokieGator 01/22/2019 2:17PM

I think that's condensation, and the higher flow when the unit... -- MP4VT2004 01/22/2019 2:01PM

With no direct water source, it has to be from condensation. ** -- MikeVT85 01/22/2019 1:48PM

Would snow getting blown into exhaust and/or intake pipes do it? -- Late 80s Hokie 01/22/2019 1:54PM

I think the extreme cold had something to do with it. -- HokieSignGuy 01/22/2019 1:03PM

You and jman could be right, but here's why I think it's something else -- Late 80s Hokie 01/22/2019 1:08PM

I think it depends on the cavity the exhaust pipe goes out of.... -- HokieSignGuy 01/22/2019 2:29PM

Lower humidity? It does get lower as the temp decreases (no frost either) -- 48zip 01/22/2019 1:21PM

Is it a high efficiency furnace? Those are (or can be?) condensing type -- jmanatVT 01/22/2019 12:59PM

I think that's condensation, and the higher flow when the unit...

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