Napoleon
Flame Disturbance Due to Airflow
Furnace starts normally but shuts off when blower starts
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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
Incorrect blower speed causing negative pressure, Leaking burner compartment gasket, Cracked heat exchanger
How to Fix / Troubleshooting
Safety first: This symptom can indicate a serious heat exchanger or combustion issue. Turn off the furnace and have it inspected.
- Visual checks: Inspect burner compartment door gaskets and seals. Replace any that are damaged to prevent blower air from disturbing the flame.
- Observe flame: A technician can observe the flame pattern as the blower starts. If the flame lifts or is pulled away from the burner, there may be a heat exchanger or airflow issue.
- Professional diagnosis: Heat exchanger inspection and blower speed adjustments should be performed by a licensed HVAC technician.
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Repair Difficulty
Professional Required
5/5
Required Part
Heat Exchanger Assembly
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