Robot mower displays E6 and stops; blades do not rotate and a grinding or blocked sound may be heard.

Safety first: Turn OFF the main power switch and remove the battery connector. Wait until all moving parts have stopped. Wear gloves when handling blades.

Unblocking and inspection:

• 1. Turn mower upside down: Support it securely to avoid tipping. Do not rest weight on the blade disc.
• 2. Remove debris: Clear any branches, stones, or rope/string wrapped around the blade disc or motor shaft. Use pliers if needed.
• 3. Check blade condition: Inspect Yard Force replacement blades for cracks, bends, or excessive wear. Replace as a set if damaged. Ensure blades pivot freely on their screws (for pivoting blade models).
• 4. Spin disc by hand: The cutting disc should rotate smoothly with slight resistance. If it feels rough or seized, the blade motor bearings may be failing.
• 5. Reduce grass height: If the lawn is very long, pre‑cut with a conventional mower to a manageable height, then resume robotic mowing.
• 6. Electrical check: If E6 appears immediately on start with no mechanical blockage, the blade motor may be shorted or the motor driver on the main PCB may be faulty. Test motor resistance with a multimeter and compare to spec.
• 7. Replace blade motor: If the motor is noisy, overheats, or tests open/short, replace the blade motor assembly with the correct Yard Force part.