Cordless vacuum shows E11 or a sensor icon; unit may run erratically, changing power levels on its own.

Safety first: Remove the battery before accessing internal sensor areas.

• Locate the sensor: On some Bush models with auto power modes, a dust or airflow sensor is located near the cyclone or air path. Look for a small clear window or sensor housing.
• Clean sensor area: Use a soft, dry brush or compressed air (short bursts) to remove dust from the sensor window and surrounding area. Do not use liquids.
• Check connections (advanced): If you open the main body, locate the small sensor connector on the PCB and ensure it is firmly seated. Look for broken wires or corrosion.
• Reset the unit: Reassemble, reinstall the battery, and perform a power reset (hold power button for 10–15 seconds). Then test in manual power mode if available.
• Replace sensor or PCB: If E11 persists and the vacuum still behaves erratically, the sensor module or main PCB may need replacement. These are typically service-level repairs.