Furnace will not start heating cycle; status LED shows 5 flashes repeating; blower may run continuously.

Critical safety warning: A flame rollout condition is dangerous and can indicate a cracked heat exchanger or blocked flue. Do not repeatedly reset rollout switches without finding the cause. If you see signs of scorching around burners or smell strong combustion fumes, shut off the furnace and call a licensed HVAC technician immediately.

Basic homeowner checks (non-invasive):

• Check air filter: Turn off power. Remove and inspect the return air filter. Replace if dirty or clogged to ensure proper airflow.
• Inspect vent termination: From outside, verify the exhaust vent is not blocked by debris, snow, or nests.
• Visual inspection: With power off and burner door removed, look for obvious soot buildup, melted wiring, or scorch marks around the burner compartment. Do not attempt to disassemble the heat exchanger.

Resetting rollout switch (if accessible): Some Luxaire furnaces have manual-reset rollout switches near the burners. Only reset once after the furnace has cooled, and only if there are no visible signs of damage. Press the red or white reset button on the switch. If it trips again, leave the furnace off and call a professional.