That unfortunate experience taught me to check, clean, and flush out
the pipe at least once a year. I took pictures of the process this
time and created a quick guide.
Here's the gallery page - http://www.paulstravelpictures.com/HVAC-Condensate-Drain-Pipe-Cleaning-Guide
A wet/dry vacuum makes the procedure easier, but just flushing out the
pipe with water is usually enough to keep the pipe relatively clear.
Cheers,
Paul Michaels
Ft. Lauderdale, FL
Why pay attention to someone who makes so many household blunders?