dougrainer wrote:
... I have NEVER found a sail switch that has dust or debris causing it to not work. Maybe it happens but I have worked on thousands of furnaces in 40 years. ...
dougrainer, go to 55 seconds in this video:
click here.This is similar to what mine looked like last night when I pulled it. Although mine was not that dirty. There was just enough lint and cat hair caught right where the sail hinges to the switch itself, preventing the sail to push the tiny button behind it. I simply removed the "wad" and blew the remainder out. Furnace has cycled well ever since. We are in it now. It's getting cold outside! Yuck, rain and cold in Indiana today!