Robot mower does not move forward or backward; display shows E03 when a mowing cycle is started.

Safety first: Turn OFF the main power and keep the mower on a stable surface. Avoid placing hands near the blade area.

• Check wheels for obstructions: Inspect both drive wheels for stones, branches, or compacted mud in the treads or around the axle. Remove any debris.
• Free the gearbox: Gently rotate each wheel by hand. Both sides should turn with similar resistance. A wheel that is locked or very stiff indicates a gearbox or motor issue.
• Inspect wheel motor cables: If accessible, open the side covers and verify that the left and right drive motor connectors are fully seated on the main board.
• Test on flat ground: Place the mower on a flat area and start a manual drive or test mode (if available). Listen for motor noise. If one side does not respond, that motor assembly is suspect.
• Do not force movement: Forcing a jammed wheel can damage gears. If E03 persists after cleaning, the affected wheel motor/gearbox or the main control board should be replaced by a technician.