Dyson V15 Detect showing “Reactive suction does not change when dust increases” has a specific manufacturer-backed troubleshooting path. Match the exact light, sound or behaviour before cleaning, resetting or ordering anything. Confirm “Reactive suction does not change when dust increases” exactly, including the full number, colour, flash order, spoken phrase or screen text. If any element differs, use the guide for that other indication instead. Dyson — V15 troubleshooting documents this condition for Dyson V15 Detect. It identifies the branch to test, but it does not by itself prove that a battery, motor, board, sensor, dock or replaceable part has failed. Fit the compatible cleaner head, select Auto mode and confirm particle count is enabled; turning the graph off also stops automatic suction adjustment. Test with a small controlled pile and change sensitivity only through the settings menu. Switch the vacuum off and disconnect its charger or mains plug before removing an accessible tool, bin, filter or brush. Never open the motor body, charger or battery pack. Run only one normal start, charge or cleaning cycle after the documented check. If “Reactive suction does not change when dust increases” returns unchanged, record the code, model and serial number and contact authorised Dyson support instead of repeating resets or guessing a part.
Models covered
Safety first
- Switch the vacuum off and disconnect its charger or mains plug before removing an accessible tool, bin, filter or brush. Never open the motor body, charger or battery pack.
What the symptom may indicate
Checks in the right order
- Identify the exact indication
Confirm “Reactive suction does not change when dust increases” exactly, including the full number, colour, flash order, spoken phrase or screen text. If any element differs, use the guide for that other indication instead.
- Safe check to perform
Fit the compatible cleaner head, select Auto mode and confirm particle count is enabled; turning the graph off also stops automatic suction adjustment. Test with a small controlled pile and change sensitivity only through the settings menu.
- What to do after the test
Run only one normal start, charge or cleaning cycle after the documented check. If “Reactive suction does not change when dust increases” returns unchanged, record the code, model and serial number and contact authorised Dyson support instead of repeating resets or guessing a part.
Stop and get qualified help when
- Stop for a swollen or unusually hot battery, burning or electrical smell, smoke, liquid ingress, a damaged lead, sparking or harsh motor noise. Run only one normal start, charge or cleaning cycle after the documented check. If “Reactive suction does not change when dust increases” returns unchanged, record the code, model and serial number and contact authorised Dyson support instead of repeating resets or guessing a part.
Next step
Repair, replace a part, or arrange a diagnosis?
Use the checks and stop conditions above to choose a cautious next step. A symptom alone never proves that the appliance has failed.
Resolve it without buying anything
Complete the 3 user-accessible checks in order. If normal operation returns and no warning sign remains, no replacement is indicated.
Replace only the confirmed part
If the checks isolate a worn or blocked component, match its complete reference to the exact appliance model before ordering.
This guide does not identify a replacement part. Do not order a generic component from the symptom alone.
Arrange a diagnosis before replacing the appliance
Stop at any warning sign listed above. A qualified diagnosis should confirm that repair is unsafe, unavailable or uneconomical before an appliance replacement is considered.
Sources used
- Dyson — Dyson, V15 troubleshooting: “Turning off the particle count and graph will stop your machine automatically adjusting suction power.” This exact manufacturer wording anchors the check for Dyson V15 Detect.
Last checked: 30 August 2026