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My name is Billy. Is the furnace vented outside with 1 or 2 pipes?
If you remove the combustion air pipe does the furnace run?
when you cleared drain...did you use a shop vacuum and apply direct suction to the furnace itself at drain point?
my concern is not the drain lines..it is the secondary heat exchanger inside the furnace...did you apply suction to the drain coming from furnace?
thank you...tell me if you get sludge out...
usually a sign of back up....have you tried the unit now?
are all the fins on the inducer wheel?
Ok, keep me posted..