E11 displayed, machine runs but suction is reduced and motor pitch is high

Safety first: Unplug before removing filters.

• Remove and inspect filters: Take out the pre‑motor and post‑motor filters. If they appear grey, dusty, or damp, they need cleaning or replacement.
• Wash washable filters: Rinse under cold running water until clear. Do not use detergents. Squeeze out excess water and allow to air dry for at least 24 hours.
• Replace non‑washable filters: If your model uses a sealed HEPA filter, replace it with a genuine Dyson part when airflow is reduced or as per maintenance schedule.
• Refit correctly: Ensure filters are fully dry and seated in the correct orientation. Misfitted filters can trigger E11.
• Reset: Some models may require a filter reset via the user interface; follow the manual if applicable.