I had a high efficiency gas furnace installed early summer by an out of work former HVAC installer. This winter, I turned on the heat and it worked fine for a few days. Called up the installer and his number is no longer operational. Went to his house and he's left for parts unknown presumably for a job.
Anyway, the heating system shut down after a few days. Come to find out that the flue/exhaust pipe near the furnace was full of water. Well I drained it, made sure that the end exiting the house was turned down so water wouldn't get in and, the system worked, for a few days. Again, the water problem.
It seems to me, that the steam in the exhaust gases is condensing on the cool PVC and backing down to the furnace exhaust port. Is the exhaust/flue pipe supposed to have a slight upward incline in these new systems like mine does. If not, where does the water that condenses in the flue pipe go??? I know there is a drain but, I figured that was for the AC.
Dave in NC