Vacuum bags — check the pre-motor filter when you fit a new bag
Vacuum bag
When suction stays weak after a new vacuum bag, check and clean the pre-motor filter before blaming the bag collar — one beat past the bag swap.
Vacuum bags alone do not fix vacuum lost suction if the pre-motor filter is clogged. After you seat a new bag (including a HEPA bag), check that secondary filter before you reorder another collar size.
Check the pre-motor filter when a new vacuum bag still feels weak
- Install the new bag with the collar fully seated and the door latched until any interlock clicks.
- Open the pre-motor filter cover (often behind the bag chamber or under a separate flap) and check for packed dust.
- Clean or replace that filter per the manual — washable types must dry fully before reinstall.
- Retest suction on a clean hard floor. If it is still weak with a new bag and a clear pre-motor filter, check the hose clog and exhaust filter next.
Honest stop: a torn pre-motor filter or a motor that smells hot needs service — do not keep running with a missing filter pad.
More help
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- Related fixes elsewhere: Vacuum lost suction — check bag and filters · Vacuum bags — check exhaust after a new HEPA bag feels weak