The airways are soiled.
Clean all the airways.
Disassemble the floorhead, hose, handle, and telescopic wand.
Remove soiling from the floorhead, hose, handle, and telescopic wand.
The operating noise of the vacuum cleaner changes during vacuuming (canister vacuum cleaner).
Clean all the airways.
Disassemble the floorhead, hose, handle, and telescopic wand.
Remove soiling from the floorhead, hose, handle, and telescopic wand.