Why does water buildup in condensation tube and shut furnace down?Post created: 2013-01-05 Type of Equipment: Furnace Views: 19This question was created on the page: http://www.furnacecompare.com/furnaces/armstrong/ultra-v-tech-91.html. Our air tech 91 furnace keeps shutting off because of water buildup in condensation drain tube. What would cause this? Thank you for your time. Your Answer |