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BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22678
Experience:  Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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water/condensation dripping from exhaust vent on furnace going

Resolved Question:

water/condensation dripping from exhaust vent on furnace going into attic took Y connection off vent pipe does not appear clogged does have discolur from asphalt sealant on inside of pipe. double wall to roof. What are possible causes?
Submitted: 5 years ago.
Category: HVAC
Expert:  BillyHvac replied 5 years ago.

Is this propane or natural gas?



Customer: replied 5 years ago.
natural gas
Expert:  BillyHvac replied 5 years ago.

Thank you.


The discolorization is commonly from the incomplete combustion...meansin something is wrong in the burning process. Either the pressure is off on the gas supply to burners, the burners are dirty, orifices are dirty or the heat exchanger has a crack.


The heavy condensation is a from the combustion process.


I would strongly recommend having the pressure/firing rate checked, make sure inducer motor fins are clean and clear and make sure there are no vent restrictions.



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