Robot mower stops and displays E2; blades do not spin when mowing should start.

Safety first: Switch OFF the main power and remove the battery connector before inspection. Keep hands away from the blade disc.

Steps to resolve:

• 1. Check slope: Yard Force robot mowers have a maximum gradient rating (often 30–40%). If the mower is working on a steeper bank, relocate the boundary wire to avoid that area. Test the mower on a flat section to see if E2 disappears.
• 2. Inspect wheels and chassis: Verify that all wheels rotate freely and are not stuck in ruts or holes that cause the mower to lean excessively. Fill holes and level uneven patches.
• 3. Clean underside: Built‑up grass under the deck can wedge the mower at an angle. Scrape off compacted grass with a plastic scraper and brush.
• 4. Check tilt sensor connection: With power OFF, remove the top cover. Locate the tilt sensor module (often a small board or sealed sensor fixed to the chassis) and ensure its connector is firmly seated on the main PCB. Look for corrosion or moisture.
• 5. Dry out moisture: If the mower was used in heavy rain or washed with a hose, allow it to dry indoors for 24 hours. Moisture can cause false tilt readings.
• 6. Replace tilt sensor: If E2 appears even on level ground and wiring is intact, replace the tilt sensor module with the correct Yard Force spare part.

Note: If replacing the sensor does not help, the main control board may be defective and should be diagnosed by a professional.