E12
Honda Keypad / User Interface Communication Error

Robot mower shows E12 and will not respond to commands from the control panel.

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Safety Warning

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.

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Possible Causes

Loose keypad ribbon cable, Moisture in keypad panel, Damaged keypad PCB, Faulty main control board interface

How to Fix / Troubleshooting

Safety first: Turn OFF the mower and disconnect the battery before opening the control panel.

  • Inspect keypad area: Check for signs of water ingress or physical damage to the top control panel.
  • Check ribbon cable: Remove the control panel cover and locate the flat ribbon cable connecting the keypad to the main PCB. Reseat both ends carefully.
  • Dry moisture: If condensation or water is present, gently dry the area with a lint‑free cloth and allow it to air dry completely before reassembly.
  • Test buttons: After reassembly, power ON the mower and test each button. If some keys still do not respond, the keypad PCB may be defective.

If E12 persists after reseating and drying, replace the keypad/user interface module. If that does not resolve it, the main control board may be at fault.

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Repair Difficulty

Hard 4/5

Required Part

Keypad / Control Panel
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