Robot vacuum displays E6 and refuses to start; often associated with a stuck caster wheel or front wheel error.

Safety first: Power off the robot and turn it upside down on a soft surface.

• Remove the caster wheel: Grip the front caster wheel and pull straight up; on most Neabot models it will pop out of its socket.
• Clean the axle: Remove hair and fibers from the caster shaft and the socket using tweezers and a dry cloth.
• Check rotation: Spin the caster wheel on its axle by hand. It should rotate freely without grinding. If it feels rough or seized, replace the caster wheel assembly.
• Clean the socket: Blow out dust and debris from the caster socket. Ensure the socket is not cracked.
• Reinstall and test: Push the caster back into the socket until it clicks. Power on the robot and start a cleaning cycle.

Warning: Do not apply grease or oil to the caster; it will attract dust and can cause future jams.