Robot mower shows E20 and stops with a 'Motor Overload' or 'Overcurrent' message not specific to blade or wheels.

Safety first: Turn OFF the mower, remove the battery, and wait for all parts to stop before inspection.

• Visual inspection: Check all motor cables (blade and drive motors) for crushed insulation, exposed copper, or melted connectors. Repair or replace damaged harness sections.
• Isolate motors: Disconnect one motor at a time and attempt to start the mower (without blades engaged where possible) to identify which motor triggers E20.
• Check for jams: Ensure the blade disc and both drive wheels rotate freely by hand. Clear any obstructions.
• Component replacement: Replace any motor that runs hot, smells burnt, or has visible damage. If all motors are good, the main board's current sensing circuit may be faulty and require replacement.
• Do not bypass fuses: Never bypass internal fuses or protection devices; they prevent fire and further damage.