Armstrong Air Flame Lift-Off or Unstable Flame

Furnace starts but shuts down after a few seconds; LED may show flame-related codes intermittently.

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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

High static pressure in duct system, Blocked heat exchanger, Incorrect gas pressure, Cracked burner or misaligned crossover

How to Fix / Troubleshooting

Safety: Unstable flame can damage the furnace and pose safety risks. Professional evaluation is recommended.

Homeowner checks:

  • Filter and vents: Replace filter and open all vents to reduce static pressure.

Technician checks:

  • Measure static pressure and compare to Armstrong Air specifications.
  • Inspect heat exchanger and burners for blockage or damage.
  • Verify gas pressure and adjust as needed.
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Repair Difficulty

Professional Required 5/5

Required Part

Burner Assembly
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