Status LED flashes six times, furnace may start but shuts down quickly or will not ignite.

Critical Safety Warning: A rollout condition can indicate a serious combustion or heat exchanger problem. Turn off power and gas to the furnace immediately. Do not attempt repeated resets without identifying the cause.

This code means a rollout switch has opened due to flame or excessive heat leaving the burner area.

• Inspect rollout switches: With power off, locate the rollout switches near the burners. Some are manual reset; press the reset button if present. If they trip again, stop and call a professional.
• Check burner compartment: Look for soot, scorch marks, or melted wiring around the burners—signs of improper combustion or flame rollout.
• Inspect venting: Verify the flue pipe is intact, properly sloped, and free of obstructions. Check for collapsed sections or disconnected joints.
• Do NOT operate with panels removed: The furnace must only be tested with all burner and blower doors in place to ensure proper airflow.

When to call a professional: Always involve a qualified HVAC technician for rollout faults. A cracked heat exchanger or severe venting issue may exist and requires professional diagnosis and repair.