Furnace causes noticeable vibration or rattling noises during operation.

Safety: Turn off power before tightening screws or touching moving parts.

Steps to check:

• Panel screws: Ensure all access panels on the Heil furnace are properly seated and screws are tight.
• Blower housing: Inspect the blower assembly mounting rails and screws; tighten any loose fasteners.
• Inducer mounting: Check that the inducer assembly is firmly attached and gasketed to the furnace.
• Isolate vibration: Gently press on different areas of the cabinet while the furnace runs to locate the source of rattling.

When to call a pro: If the blower wheel is out of balance or the inducer is excessively noisy, a technician should remove, inspect, and replace the affected component.