The furnace vibrates excessively or rattles during operation.

Safety first: Turn off power before tightening or adjusting components.

• Step 1 – Panel and casing: Tighten all access panel screws and check that panels fit snugly.
• Step 2 – Fan and blower: Inspect the combustion fan and indoor blower for debris or bent blades. Clean and, if damaged, replace the assembly.
• Step 3 – Flue supports: Ensure the flue is properly supported and not transmitting vibration to the structure.
• Step 4 – Technician balancing: If vibration persists, a technician should check motor mounts and replace worn components.