American Standard Combustion / Venting Safety Issue

Furnace runs but carbon monoxide detector alarms or occupants experience headaches

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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

Cracked heat exchanger, Blocked flue or vent, Backdrafting due to negative house pressure, Improperly installed venting on American Standard furnace

How to Fix / Troubleshooting

Critical safety warning: If a CO detector alarms or you suspect CO, evacuate immediately, call emergency services, and do not operate the furnace.

  • Shut down furnace:
    • Turn off power and gas supply.
  • Ventilate home:
    • Open windows and doors if safe to do so.
  • Professional inspection:
    • Have a licensed HVAC technician perform a combustion analysis and heat exchanger inspection.
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Repair Difficulty

Professional Required 5/5

Required Part

Heat Exchanger
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