When a Dyson SV12 (V10) vacuum:
* Revs up five to seven times, then stops, and
* The filter light flashes,

this usually means there is a problem with airflow or the filter sensor — even if the filter looks clean.

—

==== 1. Check the Filter ====
* Remove the purple filter (on the back end).
* Inspect the rubber gasket/seal for dust, hair, or damage.
* Wash thoroughly under cold water — both the inner cone and outer foam.
* Shake out water and allow to dry completely for 24–48 hours.
* Reinstall securely (turn clockwise until it clicks).

Tip: A slightly damp filter will trigger the same fault again.

—

Even after general cleaning, inspect these often-missed spots: * Wand and cleaner head: Look through for obstructions or compacted dust. * Cyclone assembly: Tap gently or use compressed air to remove fine dust.
* Bin inlet flap: Ensure it opens and closes freely.

—

==== 3. Test Without Attachments ====
* Remove the wand and head — run the vacuum with only the main body and filter.
* If it runs normally: blockage or restriction is in the wand or head.
* If it still revs and stops: issue is in the main unit (filter, seal, or motor).

—

==== 4. Check for Air Leaks at the Filter Connection ====
* While running, feel for air escaping around the filter joint.
* If you feel a leak, the filter may not be sealing tightly.
* Temporary test: wrap a thin band of tape or rubber around the seal.
* If this fixes it, replace the filter or filter housing.

—

==== 5. Try a Different (Known-Good) Filter ====
* Filters can fail internally or trigger false sensor readings.
* Borrow one from another Dyson V10/SV12 if possible, or replace yours.
* Genuine Dyson filters work best — avoid cheap knockoffs.

—

==== 6. If Still Failing ====
If none of the above resolves the issue:
* The motor or mainboard airflow sensor may be faulty.
* Contact Dyson Support — they often replace the main body for a fixed fee (≈$100–$150), cheaper than buying new.

—

.