My attic AC sits on top of my furnace, which sit on a pan. If water
gets in the pan, there is a float switch, and the AC compressor will
cut off. On the AC unit there is a drain pipe that comes out by the
coil and drains out side. I have had problems with water draining down
through the furance and into the lower pan. I cleaned out the drain
pipe, and the water still gets into the pan below. A month ago the
blower motor burned out, and I had someone come out to replace it. He
said that the reason the water was building up so much was because the
old blower was wearing out. Last night I went up and checked and the
pan was full! I took the enclosure off the top of the coil, and looked
down, and could see that water was around the coils, but just below the
level of the drain line. I could hear the water dripping out into the
pan below. Is this normal condensation, and the pan that the coils sit
on have a hole in it. Can this be fixed by me, or should I bring in a
The top drain is not clogged. I can see it when I look from above.
The water that sits in the pan just below the coil, but above the
furance, is leaking down into the furnace, and into the lower pan.
The upper drain, sit just so, that about 3/4 inch of water will build
up before it will drain into it.
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