Luxaire Flame Disturbance Due to Airflow

Furnace starts normally but shuts off when blower starts, then retries.

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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, Cracked heat exchanger, Poor burner alignment, Negative pressure in furnace room

How to Fix / Troubleshooting

Safety: This symptom can indicate a cracked heat exchanger and potential CO hazard. Install a CO detector if you do not have one and contact a professional.

Homeowner checks:

  • Room ventilation: Ensure the furnace room has adequate combustion air openings and is not tightly sealed.
  • Filter and vents: Confirm filter is correct and vents are not excessively restricted.

A technician must inspect the heat exchanger, verify blower speed settings, and check combustion with instruments.

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Repair Difficulty

Professional Required 5/5

Required Part

Heat Exchanger
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