Vacuum shows E11 and suction may cut in and out; often associated with auto-power adjustment models.

Safety first: Turn off the vacuum and remove the battery before cleaning sensor areas.

• Locate dust sensor: On many Tineco models, the dust sensor is near the air path close to the dust bin or cyclone. Refer to your manual for exact location.
• Clean sensor window: Use a dry, soft brush or microfiber cloth to gently clean the transparent sensor window or opening. Do not use liquids or sharp tools.
• Clear air path: Ensure the dust bin and cyclone are clean so that air can flow freely across the sensor.
• Power reset: Reinstall the battery and power on. Switch between manual and auto modes to see if the error clears.
• Service recommendation: If E11 persists, the dust sensor or its wiring may be defective and should be replaced by a technician.