Robot vacuum stops and displays E3, often after moving a short distance; may spin in place or fail to drive straight.

Safety first: Turn the robot OFF and remove it from the dock. Work on a stable table.

• Step 1 – Inspect wheels: Check both drive wheels for trapped debris, cables, or carpet fibers. Remove any obstructions from the wheel wells and suspension springs.
• Step 2 – Free wheel movement: Manually rotate each wheel. They should turn smoothly with light resistance. If one wheel is stiff or locked, inspect deeper for hair wrapped around the axle and remove it with tweezers.
• Step 3 – Test on lift: Turn the robot ON while holding it in the air and start a cleaning cycle. Observe whether both wheels spin. If one wheel does not move, the motor or its wiring may be faulty.
• Step 4 – Check connectors: Remove the bottom cover to access the drive wheel motors. Verify that each motor connector is fully seated on the mainboard and that no wires are broken or corroded.
• Step 5 – Replace wheel module: If a wheel still fails to run or runs erratically, replace the affected Medion drive wheel module (motor + gearbox + wheel). Reassemble and test.
• When to seek service: If both wheels fail simultaneously and wiring is intact, the mainboard motor driver may be defective and should be serviced by a technician.