Strong burning or electrical smell when furnace runs.

Safety first: If you smell burning plastic, see smoke, or suspect an electrical fire, turn off power at the breaker and call emergency services.

Steps to check:

• Initial seasonal odor: A mild burning dust smell for the first 10–30 minutes of operation at the start of the heating season is common. Open windows briefly to ventilate.
• Inspect blower motor: If the smell persists, turn off power and check the blower motor for discoloration, melted insulation, or a hot, burnt odor. Replace the motor if overheating.
• Check wiring: Look for discolored or melted wire insulation at the control board, blower, and gas valve. Tighten loose connections and replace damaged wires.
• Inspect supply registers: Ensure no plastic items, toys, or debris are in or near registers that could be heated.

Any ongoing burning or electrical smell warrants a professional inspection to prevent fire risk.