Water in air intake pipe and inside furnace.
My Tempstar high efficiency furnace has water draining down the air intake pvc, and into the furnace all over the burner and gas valve etc. Furnace is 6 years old, but I never noticed this problem before.
The intake and exhaust are both vertical up through the roof 2" pvc. They are 6ft long between furnace and roof, and 2 ft outside above roof. Intake has 2 elbows and points back down toward roof. Pipes are 20" apart with exhaust 6" higher than intake. In 10 degree and colder weather, I get some icicles forming out of intake opening.
I'm wondering if warmth from the furnace could be rising up and causing condensation to freeze? Both pipes are in a heated space until they pass through the roof.
The inducer motor was replaced last week due to pressure switch shutdowns. But this was during a below zero sustained temp cold snap, and I'm wondering if the intake could have been iced closed? Temps were above freezing a couple days, so I'm guessing it all thawed out, but now we are going below zero again, and I am worried it will ice up again and damage my new inducer.
Has anyone had this happen? Should I try insulating the pipe up to the roof?
Any suggestions are appreciated!
Larry in frigid northern Wi.