The furnace rattles or vibrates loudly when running.

Steps to check:

• Tighten panels: Ensure all Trane furnace access panels are properly seated and screws are tight.
• Check blower mounting: Inspect blower housing mounting bolts and brackets for looseness.
• Duct connections: Tighten or reinforce sheet metal ducts at the furnace plenum with screws and foil tape.
• Leveling: Verify the furnace is level on its platform or pad; shim if necessary.

When to call a professional: If vibration persists, a technician should check blower balance and motor mounts.