Ruud Flue Condensation / Improper Venting

Water dripping from metal vent pipe on mid-efficiency Ruud furnace (non-condensing).

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.

Possible Causes

Undersized or uninsulated vent pipe, Long horizontal vent run, Low flue gas temperature due to oversized furnace, Negative house pressure drawing cold air into vent

How to Fix / Troubleshooting

Safety: Flue gas condensation can lead to corrosion and vent failure. Have venting evaluated by a professional.

Homeowner steps:

Inspect vent joints: Look for loose or corroded joints and signs of water staining.
Check for backdrafting: Hold a smoke source near the draft hood (if present) to see if flue gases are spilling into the room. If so, shut off the furnace and call a technician.
Professional vent assessment: A Ruud technician should verify vent sizing, slope, and material and correct as needed.

Repair Difficulty

Hard 4/5

Required Part

Flue Vent Pipe

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