Furnace Exhaust Fan Full Of Water

Look in your install manual most manufacturers will call for the furnace to be installed with a slight forward pitch to allow condensate to drain from the heat exchanger.

Furnace exhaust fan full of water.

You can prevent slime and eliminate drain tube clogs in two easy steps. Water may accumulate due to a broken silver bladder or faulty insulation. There should be no water involved with a standard efficiency furnace. As the exhaust gases cool down during the primary and secondary heat extraction water usually condenses and flows out of the furnace.

You can identify a condensing furnace by the pvc vent pipe that allows exhaust gases to exit the appliance after they have cooled down. If you have a condensation leak with a standard efficiency then its exhaust or flue pipe may be incorrectly sized. Avoid double trapping and vent the drain after the trap to prevent airlocks. The fan assist is meant to help with the natural draft not pressurizing the exhaust pipe with a power vent fan found in condensing furnaces and discussed below.

First remove the drain tube and fitting. If there is water in the blower box contact a professional repairman to replace the blower box and silver bladder. Condensation from air conditioning coils contains bacteria that can form slime and clog the condensate pan drain tube. Water in condensing gas furnaces condensing furnaces also known as high efficiency furnaces are generally in the 90 to 97 efficiency range.

When you see water puddling around the furnace with the a c running you have a clogged condensate drain tube. A standard efficiency furnace extracts some heat from the combustion gases and quickly vents them out the exhaust or flue pipe.