Robot reports E7 and refuses to start cleaning; often occurs when placed on very thick carpet or an uneven surface.

Safety first: Turn off the robot.

• Relocate robot: Move the robot to a flat, hard surface and ensure all wheels are in contact with the floor.
• Inspect front caster: Check that the front caster wheel spins freely and can rotate 360°. Remove hair and debris from the axle.
• Check for obstructions: Ensure nothing is wedged under the robot that could lift it (e.g., cables, toys, door thresholds).
• Restart: Power the robot back on and start a cleaning cycle.
• If E7 persists on flat floors: The internal Tilt / Lift Sensor or wheel height sensors may be faulty. This typically requires opening the unit and replacing the sensor board or main PCB.