US Stove Incomplete Combustion or Venting Problem

Furnace operates but carbon monoxide detector in home alarms during use.

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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

Blocked or undersized vent, Poor draft, Leaking flue joints, Incorrect installation or clearances

How to Fix / Troubleshooting

Critical safety warning: If a CO detector alarms, turn off the furnace immediately, ventilate the home, and do not use the furnace until the issue is resolved. Carbon monoxide is deadly.

Steps:

  • 1. Shut down and ventilate: Turn off the furnace and open windows and doors to air out the home.
  • 2. Inspect venting: Check for blockages, improper slopes, or damaged vent components. Clean and repair as needed.
  • 3. Check seals: Ensure all vent joints and appliance connections are sealed and secure.
  • 4. Professional inspection: Have a qualified technician or chimney professional inspect the furnace, venting, and combustion settings before using the unit again.
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Repair Difficulty

Professional Required 5/5

Required Part

Venting System Components
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