I recently moved into a new house that has a Bryant Legacy series 90 percent efficient furnace. I understand that these high efficiency furnaces do have moisture condense from the exhaust gases, so they have a drain just like the a/c coil does.
I have noticed that my furnace has started making a noise that I never heard before. It sounds literally like water running (not dripping) down the flue pipe. It makes this noise as soon as the burner starts firing. I am confused about two things. First, it sounds like a lot of water. Second, when I check the drain pipe, there is absolutely no water coming out.
Does anyone know the source of this noise, is it water, and is this normal for one of these furnaces?