Display shows “Error 3 – No drive” and the mower does not move even though the blades may spin.

Safety first: Press STOP, switch the mower OFF, remove the key (if equipped), and disconnect the charging station power before working underneath the mower.

• Check for obstructions: Lift the mower and inspect both rear drive wheels. Remove any stones, branches, or packed grass blocking wheel rotation.
• Spin wheels by hand: Each drive wheel should rotate with some resistance but without grinding or locking. A seized wheel may indicate a failed bearing or gear in the drive unit.
• Inspect wheel hubs: Verify that the wheels are firmly attached to the drive shafts and that the plastic drive teeth are not stripped.
• Check drive motor cables: Open the mower housing according to the Gardena service instructions. Inspect the connectors from the main PCB to each drive motor for corrosion, loose pins, or damaged insulation.
• Test motors individually: If you have a low-voltage DC supply and experience, briefly power each motor off the mower to confirm it runs smoothly. Replace any motor that does not spin or makes loud grinding noises.
• Reassemble and test: Reconnect all cables, close the housing, place the mower on the charging station, and start a test run.

If both motors test good but Error 3 persists, the main control board drive stage is likely defective and should be replaced by a qualified technician.