Concord
Flue Condensation
Water is dripping from the metal flue pipe of a standard-efficiency Concord furnace.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Undersized or uninsulated flue, Long horizontal flue run, Low return air temperature, Improper draft hood or vent connector
How to Fix / Troubleshooting
Safety: Turn off furnace before inspecting venting. Flue gases can be hot and contain carbon monoxide.
Steps:
- Visual inspection: Check for obvious gaps or holes in the flue pipe and repair or replace sections as needed.
- Check slope: Ensure the vent connector slopes upward toward the chimney or termination to allow condensate to flow away from the furnace.
- Insulation: In unconditioned spaces, insulating the vent (where code allows) can reduce condensation.
Note: Persistent flue condensation may indicate vent sizing or combustion issues that require professional evaluation.
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Repair Difficulty
Hard
4/5
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