Direct answer
For the Dyson V15 Detect cordless vacuum, the filter must be the correct part, clean, fully dry and seated while the airflow path is clear. First, remove and clean by the exact model instructions.
What this covers
- Dyson V15 Detect cordless vacuum (SV22 / V15 Detect)
- Dyson vacuum; filter, battery, cleaner head and LCD fault behavior vary by model.
- The specific fault this record addresses: filter warning stays on
What it does not cover
- ×The same symptom on a different Dyson product line, which has its own record and its own cited source
- ×An on-screen error code whose meaning has not been checked against this exact model's manual
- ×Live electrical, gas, sealed-system, internal battery-cell or structural repair — a technician boundary, not a self-service step
Differential
What actually causes this, and how to tell them apart
These are ordered by how often each one is the answer, not by how easy it is to try. The point of the middle column is that two causes producing the same headline symptom rarely produce the same detail — that detail is what tells you which one you have before you change anything.
- 1
The filter is dirty and needs the model's specific cleaning method
What separates it The warning appeared after normal extended use with no recent maintenance.
How to confirm Clean using the exact method the manual specifies — some filters are rinse-only, others allow gentle brushing, and using the wrong method can damage the media.
- 2
The filter was reinstalled before fully drying
What separates it The warning persists or returns quickly after a recent wash, despite the filter looking clean.
How to confirm Allow the complete drying time the manual specifies — often 24 hours or more — before reinstalling; a damp filter reads to the sensor the same as a dirty one.
- 3
A different blockage elsewhere is being misattributed to the filter
What separates it The warning stays on even with a confirmed clean, dry, correctly seated filter.
How to confirm Check the rest of the airway for a separate obstruction — some models can't distinguish a genuinely restricted filter from restricted airflow elsewhere.
- 4
A pressure or airflow sensor has failed
What separates it The warning is present with a confirmed clean, dry filter and a confirmed clear airway.
How to confirm This is a technician diagnosis reached once every mechanical cause is ruled out.
Before you touch a setting
Record this first — changing settings destroys the evidence
Every item below stops existing the moment a reset, re-pair or settings change is made. Written down first, they are what separates the causes above; recovered afterwards, they are guesswork.
- How long ago the filter was last cleaned, and by what method.
- Whether it was fully dried per the manual's stated time before reinstalling.
- Whether suction and other symptoms are otherwise normal, or also degraded.
Remove and clean the filter using the exact method the model specifies
ReversibleRinse-only versus brush-safe methods differ and using the wrong one can damage the media.
Allow complete drying before reinstalling
ReversibleA damp filter restricts airflow the same as a dirty one and will not clear the warning.
Check the rest of the airway for a separate blockage if the warning persists on a confirmed clean, dry filter
ReversibleSome sensors can't distinguish the filter itself from downstream restriction.
Model-specific
What is true of this model and not of its siblings
Generic advice for the product line fails here. Each item below is a property of this specific model family that changes which of the steps above apply to you.
- Model scope
- SV22 / V15 Detect. Dyson vacuum; filter, battery, cleaner head and LCD fault behavior vary by model.
- Type — cordless stick (battery)
- A CORDLESS STICK vacuum with a click-in, replaceable battery. Runtime depends heavily on mode: Boost/MAX drains the battery in minutes by design, so 'short runtime on MAX' is normal — Eco mode runs far longer. A vacuum that pulses/stops is usually a blocked airway (bin, filter, wand) triggering the protection, or a battery too hot/cold.
- Laser + piezo dust detection
- The V15 projects a green laser on the floor to reveal fine dust and counts particles on its LCD screen. If the laser/counts seem wrong, that is a detection feature, separate from suction; the laser only works on hard floors at a low angle.
- Filter & airway
- One washable lifetime filter — wash it monthly and let it dry fully (24 hours) before refitting; a damp or clogged filter causes suction loss and pulsing. Clear the wand, bin inlet and cyclone of blockages for 'no suction'.
- Symptom boundary
- This record covers Dyson V15 Detect cordless vacuum when it filter warning stays on. A different symptom on the same hardware, or this symptom on a different Dyson product line, has its own record with its own causes and its own cited source.
Stop boundary
When this stops being a self-service repair
Continuing past any one of these costs more than the repair saves — in safety, in warranty, or in evidence a technician needs.
- !Never run the vacuum without its required filters installed, even temporarily, to try to clear the warning — this exposes the motor to damage.
Evidence ledger
Sources behind this answer
Visible sources support the visible claims. Home Product Support records the publisher, the fact used and the review date; community reports can suggest an issue but do not become a published fact on their own.
Where the manufacturer's article stops. Dyson Support publishes this as "Product support". Official Dyson troubleshooting, maintenance, parts and repair entry point. What that article does not carry is the model boundary — it is written for a product line, and SV22 / V15 Detect is the scope applied here. Where a control label, terminal, indicator pattern or reset sequence differs on your unit, the manual for that exact model is the authority, not this page and not the article.
Exact questions
Common follow-ups
My Dyson V15 keeps pulsing / stopping and starting.+
Pulsing is the V15 protecting itself, almost always from a blockage or a filter problem. Check the whole airway — empty the bin, wash the filter and let it dry a full 24 hours, and clear the wand, cleaner head and cyclone of hair and debris. A battery that is very hot or very cold also causes cut-outs; let it reach room temperature. On Boost/MAX the battery also simply runs down fast, which is normal, not a fault.
I cleaned the filter but the warning came right back.+
Check how long it dried before going back in — filters often need 24 hours or more of full air-drying, and a damp filter restricts airflow just as much as a dirty one, which the sensor reads the same way.
Does this answer apply to every Dyson model?+
No. It is scoped to SV22 / V15 Detect. Dyson vacuum; filter, battery, cleaner head and LCD fault behavior vary by model.
What should I record before troubleshooting filter warning or clean filter?+
Record the complete model identifier, exact message or indicator, software/firmware where visible, the operating stage and what still works.
Why is a factory reset not the first step?+
A reset can erase accounts, networks, maps, schedules or preferences without distinguishing filter warning, clean filter. The ordered checks preserve that evidence.
When should I stop and use qualified service?+
Never run without required filters or install them damp.
Answer for the exact device and software version shown above.