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Old 12-12-2010, 09:26 AM   #1
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90% furnace vents


what would make my funace vent drip water back into the furnace housing a flood the floor?

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Old 12-12-2010, 09:37 AM   #2
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90% furnace vents


Plugged or improperly plumbed condensate piping.

Water is a byproduct of the combustion of natural gas and 90%+ NG furnaces have to be piped for this condensate because the flu gases are too cool to carry the moisture out of the vent.

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Old 12-12-2010, 09:39 AM   #3
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90% furnace vents


where is the water coming from? 90% furnaces produce condensation in the flues and secondary heat exchanger. Furnace should have a drain line. If condensate is coming from flue fitting or joint, then it wasn't primed and glued properly. It's also possible for the trap in the furnace to plug up
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Old 12-12-2010, 09:40 AM   #4
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90% furnace vents


It sounds like the tube from your vent fan may be plugged if the condensate is leaking inside the unit. There will be a small, usually black (sometimes gray) fan housing inside the burner compartment. Check the small flexible hose coming off the bottom of this fan for a restriction.
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