"R. Gerard" wrote in
message

rthlink.net...
In article
.
com,
"Ctal" wrote:

We've got an attic AC unit. Over the past week
the AC has shut down
(wonderful in our 90+ summer weather). It's
doing this because of a
kill switch in the drip pan. As the drip pan
fills up, it raises a
float on the switch and shuts the unit off.

I just had a similar problem with our heat pump.
I have two compressors
in the back yard, and one air handler in the
attic and the other in the
basement.

We discovered a very wet ceiling in the basement
of our 3-story
townhouse in MD.

Presuming a leaking water pipe, we called he
plumber who had to knock a
hole in the ceiling about two feet by 18 inches.
Looked around and
determined that it was NOT a leaking pipe but a
leak from a pipe
associated with the air handler in the attic.

The heat pump guys came out and checked the attic
air handler and
determined that it was a blocked drain pipe that
handled the humidity
the air handler pulled out of the air. The water
from the air handler
went down a plastic drain pipe. The guys who
came out could not figure
out where that pipe led. They had a pistol-like
device into which you
put a COs cartridge then fire it down the blocked
drain.

They fired two of these down the drain then
followed it with a gallon
or two of water. I stood in the basement ready
to see if any water
dripped. None. Presume that's done the trick
but we are going to leave
that ceiling unrepaired for a month or two to see
if any more water
drips out. Servicemen also recommended pouring a
bottle of the drain
cleaner formulated for plastic pipes down the "Y"
joint at the head of
the drain pipe just an added insurance.

bob

Why don't you just run a new drain line?