Robot mower shows E20; may indicate generic system error or internal fault.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Firmware error, Internal communication failure between boards, Power supply instability, Defective main control board

Safety first: Turn OFF the mower and disconnect from the charging station.

Full power reset: Turn OFF the main switch, remove the battery connector (if accessible), wait 2–3 minutes, reconnect, and turn ON.
Check for other symptoms: Note any unusual noises, smells, or display behavior that could point to a specific subsystem.
Update firmware (if possible): Have an authorized Hecht service center update or reflash the firmware.
If E20 persists: The Main Control Board is likely defective and should be replaced as a complete unit.

Professional Required 5/5

Main Control Board

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