Furnace is very noisy during operation with rattling or vibrating sounds from the cabinet.

Safety: Turn off power before tightening or adjusting components.

Steps:

• Tighten panels: Ensure all Concord furnace access panels are properly seated and screws are tight. Add missing screws if necessary.
• Check blower housing: Inspect the blower assembly mounting bolts and brackets. Tighten any loose fasteners.
• Inspect blower wheel: Look for debris in the blower wheel or signs of wobble. If the wheel is bent or out of balance, it should be replaced.
• Inducer noise: If noise is from the inducer area, check mounting screws and gasket. A failing inducer bearing will require inducer replacement.