Vacuum will not start and displays a filter missing icon or message; machine beeps or flashes when trigger is pulled.

Safety: Do not operate the vacuum without all filters installed; this can damage the motor.

• Refit filters: Ensure both pre-motor and post-motor filters (if applicable) are installed. Twist or push until they click firmly into place.
• Inspect filter seating: Check for debris or damage on the filter sealing surfaces that might prevent full engagement.
• Use genuine filters: If you recently replaced the filter with a third‑party part, reinstall the original or a genuine Dyson filter to ensure compatibility with the sensor.
• Reset: Remove the battery for 30 seconds, refit, and try again. If the warning persists with genuine, correctly seated filters, the filter detection sensor or control PCB may require professional service.