Daikin furnace emits a burning smell when first started or after a long period of no use.

Safety: If the smell is strong, acrid, or accompanied by smoke, turn off the furnace and power immediately and inspect for visible burning or melted components.

Steps to check:

• Initial burn-off: A mild burning dust smell is normal for the first few heating cycles of the season. It should dissipate within an hour of continuous operation.
• Inspect interior: With power off, remove panels and look for signs of scorched wiring, melted insulation, or soot.
• Filter and cleanliness: Replace the filter and gently vacuum dust from accessible areas around the burner compartment (do not disturb burner alignment).

If the smell persists or you see signs of overheating, contact a technician to inspect the Daikin furnace wiring, motors, and heat exchanger.