A new filter can reduce airflow if it is the wrong part, installed with packaging, not seated, still damp or blocking a gasket. Compare the part number and shape with the model diagram and with the old filter. Look at the filter face and edges in good light and remove any film.
What this covers
- Vacuums · filters
What it does not cover
Differential
Likely causes of “Vacuum has weak suction after installing a new filter”, and how to tell them apart
- 1
The filter is not the right part for the model
What separates it Suction dropped right after fitting it, and the shape or gasket looks slightly different from the old one.
How to confirm Compare the part number and shape with the model diagram and with the old filter.
- 2
Packaging or a protective film is still on the filter
What separates it A plastic sleeve, sticker or foam liner is still in place and air cannot pass through.
How to confirm Look at the filter face and edges in good light and remove any film.
- 3
The filter is not fully seated, so air bypasses it
What separates it There is a whistling or hissing sound and dust appears at the exhaust.
How to confirm Reseat the filter and check that every cover and latch is closed.
- 4
A washable filter was fitted while damp
What separates it Suction is weak and the machine smells musty, and the filter was washed recently.
How to confirm Take it out and let it dry for the full time the manual states.
Before you touch a setting
Record this first — changing settings destroys the evidence
- The part number printed on the new and old filters.
- Whether suction was normal with the old filter before it clogged.
- Whether the machine has one filter or several and whether all are fitted.
Try in this order
0 of 4 completedObserve before changing anything
ReversibleCompare the part number and orientation with the old filter and exact model diagram.
Isolate the failing boundary
ReversibleRemove packaging, allow washable filters to dry for the full stated time and seat every cover and seal.
Apply the narrow correction
ReversibleTest briefly with the complete required filter set installed; never operate filterless.
Verify the result and stop at the boundary
ReversibleUse the genuine-equivalent specification and service damaged filter housings.
Stop boundary
When this stops being a self-service repair
- !Never run the machine without its filters. A cracked or deformed filter housing needs repair before the vacuum is used again.
Evidence ledger
Sources behind this answer
Exact questions
Common questions
Should a brand-new filter need a break-in period?+
No. A correctly fitted, correct part should restore suction straight away. Weak suction after a change points at the fit, the part or a second restriction.
Why is suction weak with a new filter?+
Wrong part or packaging left on.
Could it be damp?+
A damp filter restricts air.