Furnace emits a burning smell when it starts, especially at the beginning of the heating season.

Safety: A mild dusty smell for the first few cycles of the season is common. However, if the smell is strong, acrid, or accompanied by smoke, turn off the furnace immediately.

• Clean around furnace: Vacuum dust and debris from around the furnace cabinet and return air area. Do not store items against the furnace.
• Replace filter: Ensure a clean filter is installed to promote proper airflow.
• Inspect wiring (if smell persists): With power off, look for discolored or melted wires near the control board and blower motor.

If the burning smell continues after several hours of operation or you see smoke, contact a technician promptly.