How to diagnose a non closing pressure switch on a 90% furnace.

No heat call. The pressure switch was not closing and the inducer draft motor was struggling. While the unit was attempting to light I could heat water inside the system. I tried cleaned the condensate line and removed the flue pipe to see if there was any excess water. Water began pouring out of the flue. In this video I diagnose the problem and re-run the flue pipe to get proper pitch to promote proper drainage. Enjoy!

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