Robot mower displays E15 and stops, often when using optional accessories like ultrasonic sensors.

Safety first: Turn OFF the mower before removing or installing any accessory modules.

Steps to check:

• Inspect accessory: Locate the Worx accessory module (e.g., Anti-Collision System) on the front/top of the mower. Check for physical damage.
• Check connector: Unplug the accessory cable from the mower, inspect for bent pins or corrosion, and reconnect firmly.
• Test without accessory: If possible, remove the accessory completely and run the mower. If E15 disappears, the accessory is likely faulty.
• Firmware update: Ensure the mower firmware supports the installed accessory; update via app if needed.

When to call a technician: Replace the accessory module if confirmed faulty. If E15 persists without accessories, the main board accessory port may be damaged.