A vacuum loses suction most often because of a full bin, loaded bag, dirty filters, blockages, or air leaks. Before blaming the motor, follow the airflow path from the floor head to the exhaust and check each point with the machine unplugged.
Empty the bin or replace the bag before it is packed full
A packed bag or bin reduces airflow even if there appears to be some space left. Follow the fill line and clean seals so the lid closes without leaks.
Clean or replace filters as directed
Washable filters must dry completely before reinstallation; nonwashable filters should be replaced. Running the vacuum with a damp filter can damage the machine or severely restrict suction.
Look for clogs with the vacuum unplugged
Inspect the hose, wand, bends, and floor head using light from accessible ends. Do not insert metal objects that can puncture a hose or reach wiring and powered parts.
Low suction with a clear path can mean a leak or motor issue
Damaged seals, cracked hoses, and poorly closed covers let air enter outside the useful path. If everything is clear and sealed but the motor sound changes, smells burnt, or shuts down, stop using it and arrange service.
Sources
- American Cleaning Institute — Cleaning Tips — Household cleaning methods, product use and dosing, and material compatibility.