Armstrong Air
Flue Condensation Leak
Water dripping from PVC vent pipe joints or from the furnace flue connection.
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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
Improperly glued PVC joints, Inadequate vent insulation in cold spaces, Incorrect vent slope, Oversized vent causing excessive condensation
How to Fix / Troubleshooting
Safety: Turn off furnace before working on venting. Venting is a critical safety system.
Steps to check:
- Inspect joints: Look for visible water at PVC joints. If joints were not properly primed and cemented, they may leak and need to be re-piped.
- Check slope: Verify that vent pipes slope at least 1/4 inch per foot back toward the furnace or per Armstrong Air instructions.
- Insulate cold runs: In unconditioned spaces, insulate vent pipes to reduce condensation.
- Call technician: Vent system redesign or re-piping should be done by a qualified HVAC installer following Armstrong Air and code requirements.
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Repair Difficulty
Hard
4/5
Required Part
PVC Vent Piping
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