I have a Comfortmaker furnace. The fire is kicking off mid-cycle, or just not starting up at all. Both blowers are working fine. From what I am reading, it could be a bad pressure switch, or an obstruction in the exhaust valve. I just tried checking for obstructions and cleaning the hose in intakes to the pressure switch. It seems to be working now, but I'm not sure for how long. Should I try to replace the pressure switch if this continues or could it be something much more extensive. Any help you can help me out with here would be great! I haven't called a tech yet. I of course like most off us am trying not spend Christmas money if I don't have to.
Thanks in advance!!!