Drain pan under the unit in the attic is filling up with water. Over the weekend, I installed a valve inline followed by a T installed vertically to allow for pouring something into the line to flush or clean it out. I installed them in the line after it comes out and down from the unit. I've shopvac'd the line from the outside and got nothing. I've also shut the valve and blown air through the line at the T. Nothing came out except air. I'm at a loss unless there is a clog between my valve/T and the unit. There's about 6 feet of pipe between my valve/T and the unit: 2 elbows and about 4 vertical feet. What else could cause the drain pan to fill up?
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