Furnace will not start; status LED shows 7 red flashes repeating; blower may run for a short time then stop.

Critical safety warning: A flame rollout or open rollout switch indicates a potentially dangerous condition (fire or carbon monoxide risk). Turn off power and gas to the furnace immediately. Do not reset or bypass rollout switches and continue operation without a professional inspection.

Steps to check (visual only for homeowners):

• Inspect around burner compartment: With power and gas off, remove the burner access panel. Look for signs of scorching, melted wiring, or soot around the burners and front of the heat exchanger.
• Locate rollout switches: These are small manual-reset switches near the burners with a red or white reset button. If tripped, they may click when gently pressed. Do not repeatedly reset; this is a symptom, not the cause.
• Check visible vent connector: Inspect the metal or PVC vent connector near the furnace for disconnections, severe corrosion, or obvious blockages.

If a rollout switch has tripped, contact a licensed HVAC technician immediately to inspect the heat exchanger, burners, and vent system. Operation should not resume until the underlying cause is corrected and the system is verified safe.