Have problem with comfortmaker furnace with pressure switch.
Burner turn on and shut off continously and found water in the pressure switch line comming from the induced fan. I cleaned line put it back and everything working normally and after 2 days later I noticed same problem. Then I found water again in the pressure switch line. Checked in the morning found water again. I do not understand where that water comming from. Induced fan is hot and there should not be any mositure in it. And pressure switch has only one line comming from the induced fan. Someone could explain what happened on my furnace and how to fix?