Furnace produces a burning smell or hot metal odor when running.

Safety: If you see smoke or suspect an electrical fire, shut off power immediately and call emergency services.

• Initial use after long off period: A mild burning dust smell can be normal for the first few cycles. It should dissipate within an hour.
• Check air filter and vents: Replace clogged filters and ensure vents are not blocked.
• Inspect interior: With power OFF, remove the front panel and look for melted plastic, discolored wires, or insulation touching the heat exchanger. Correct any obvious issues.
• Persistent strong odor: If the smell persists or worsens, stop using the furnace and have it inspected professionally.