Napoleon
Unsafe Combustion / Flue Gas Spillage
Furnace runs but carbon monoxide detector in home alarms
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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, Inadequate combustion air, Backdrafting from negative house pressure
How to Fix / Troubleshooting
Emergency safety warning: If a CO detector alarms, turn off the furnace, open windows, evacuate occupants if levels are high, and call emergency services and a qualified HVAC technician.
- Do not operate furnace: Leave the furnace off until it has been inspected and cleared by a professional.
- Vent and combustion air check: A technician will inspect the venting system, heat exchanger, and combustion air supply, and perform combustion analysis.
- Heat exchanger replacement: If a crack or failure is found, the heat exchanger or entire furnace must be replaced.
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Repair Difficulty
Professional Required
5/5
Required Part
Heat Exchanger Assembly
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