Robot shows E18; front caster wheel may be stuck or not rotating

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

• 1. Remove caster wheel: Pull the front caster straight up to remove it from its socket (some models may require a small screwdriver to pry it out).
• 2. Clean axle: Remove hair and debris from the caster shaft and inside the socket using tweezers.
• 3. Check rotation: Spin the caster wheel by hand. It should rotate freely without grinding.
• 4. Reinstall: Push the caster back into the socket until it clicks and sits flush with the chassis.
• 5. Replace if worn: If the wheel is cracked, flat‑spotted, or still binds after cleaning, replace the caster wheel assembly.