Battery-powered Dyson carpet cleaner shows E9 and will not run even when charged

Safety first: Disconnect the charger and remove the battery pack (if removable) before inspection.

• Check battery seating: Remove and refit the battery, ensuring it clicks firmly into place. Inspect contacts for dirt or corrosion and gently clean with a dry cloth.
• Charge fully: Place the battery on the official Dyson charger and allow a full charge cycle (typically 3–5 hours). Do not use third‑party chargers.
• Test runtime: After charging, run the machine. If E9 appears immediately or runtime is very short, the battery is likely failing.
• Replace battery: Use a genuine Dyson replacement battery pack compatible with your model. Follow the user manual for battery replacement steps.
• Service if unresolved: If a new battery does not clear E9, the main body’s power electronics may be faulty and require professional repair.