E9 error, Hoover carpet cleaner indicates brush speed or brush sensor fault

Safety first: Unplug the unit before accessing the brush drive area.

• Access brush drive: Remove the nozzle and lower cover to expose the brush drive assembly. Locate the small sensor near the brush gear or shaft (if equipped).
• Clean sensor area: Use a dry brush or compressed air to remove dust and debris from the sensor and the rotating target wheel or magnet.
• Inspect wiring: Check the sensor wiring harness for pinched or broken wires. Reseat the connector at both the sensor and the control board.
• Test operation: Reassemble and test. If the error returns and brushes appear to run normally, the sensor or control board may need replacement.

Sensor replacement is usually straightforward but may require ordering the exact Hoover sensor for your model.