Carrier
Flue Condensation
Water dripping from metal vent pipe on a standard-efficiency (metal vented) Carrier furnace.
Advertisements
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.
Advertisements
Possible Causes
Undersized or uninsulated vent, long horizontal vent runs, low flue gas temperature due to oversized furnace or low return air temperature
How to Fix / Troubleshooting
Safety first: Turn off power before working near the vent. Hot flue gases can burn.
- Inspect vent connections: Check that all vent joints are properly screwed and sealed. Look for gaps where condensate can escape.
- Check vent slope: Ensure the metal vent slopes upward from the furnace to the chimney or termination, with no low spots where water can collect.
- Insulate cold sections: In unconditioned spaces, insulating around the vent (per code) can reduce condensation.
Persistent flue condensation may indicate vent sizing or combustion issues that should be evaluated by a professional.
Advertisements
Repair Difficulty
Medium
3/5
Required Part
Flue Vent Pipe
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements