Dettson Flue Condensation / Venting Issue

Dettson furnace leaks water from the exhaust vent or flue pipe.

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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 sloped vent piping, Loose vent joints, Undersized or oversized vent, Excessive condensation due to low flue temperature

How to Fix / Troubleshooting

Safety first: Turn off power and allow hot surfaces to cool before touching vent piping.

  • 1. Inspect vent slope: For condensing models with PVC venting, ensure the vent slopes back toward the furnace or to a drain as specified by Dettson.
  • 2. Check joints: Look for water stains at vent joints. Reseal with appropriate PVC cement or high-temperature sealant as required.
  • 3. Verify vent size and length: Compare installed vent size and run length to the installation manual. Incorrect venting should be corrected by a technician.
  • 4. Address excessive condensation: If condensation is heavy, a technician should verify combustion and flue gas temperatures.
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Repair Difficulty

Hard 4/5

Required Part

Exhaust Vent Piping
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