Robot shows E7 and stops, often when transitioning between floor types or over thresholds

Safety first: Turn OFF the robot and flip it over.

Step-by-step:

• Remove side brush: Use a small Phillips screwdriver to remove the screw holding the side brush, then pull the brush off the shaft.
• Clean the brush: Remove hair and threads from the bristles and hub.
• Clean the shaft area: Inspect the motor shaft and surrounding area for wrapped hair. Use tweezers to pull it out.
• Check motor rotation: Gently turn the shaft with your fingers. It should rotate with slight resistance but not be stuck.
• Reinstall or replace brush: If the brush is deformed or bristles are bent flat, replace it. Refit the brush and tighten the screw snugly, not excessively.
• Test on clear floor: Place the robot on an open area free of cords and long fringes and start a cleaning cycle.

If E7 continues: The side brush motor may be failing or its driver circuit on the main board may be damaged. Motor replacement is usually required.