Robot mower shows E12 and stops; often related to keypad or cover.

Safety first: Turn OFF the main switch and remove the mower from the charging station.

• Inspect keypad surface: Check for dirt, sap, or sticky residue around the buttons. Clean gently with a slightly damp cloth and dry thoroughly.
• Check for moisture: If the mower has been exposed to heavy rain or washing, allow it to dry indoors for 24 hours in a warm, ventilated area (do not use direct heat).
• Test button function: With power ON, press each button individually and observe if any are unresponsive or trigger multiple actions.
• Inspect ribbon cable: If comfortable opening the top cover, check that the keypad ribbon cable is firmly seated on the main PCB and not cracked or pinched.
• If E12 persists: The keypad or display PCB may need replacement as an assembly. This is typically a moderate repair best done by a service center to maintain sealing.