Armstrong Air
Flame Disturbance by Airflow
Furnace ignites but shuts off when blower starts; LED may show flame sense issues.
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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 too high, Leaking burner compartment door, Misaligned burners, Cracked heat exchanger causing cross-draft
How to Fix / Troubleshooting
Safety: This can indicate serious internal issues. Professional diagnosis is recommended.
Homeowner checks:
- Ensure doors are sealed: Verify the burner and blower doors are properly installed and latched.
Technician checks:
- Adjust blower speed on Armstrong Air control board.
- Inspect heat exchanger and burner alignment.
- Verify static pressure and duct design.
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Repair Difficulty
Professional Required
5/5
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