The display on my central

Jan 05, 2009

- I figured it out...can't believe how simple it was. There's a safety switch installed on the drain pipe coming out of my HVAC unit (mine's in a utility closet...some are in the garage). When the drain pipe gets clogged, it makes the water backup and a little bobber in the safety switch floats up and kills the thermostat. I disassembled it to test this and...viola. Interesting that it totally kills the thermostat instead of just turning off the air/heat. Anyway...I shop-vacced the water out and bought some tablets and threw them in the there to clean out the clog - hopefully that will help the flow (I've heard you can use bleach too).