Robot vacuum reports 'Error 12' / voice prompt 'Error 12: Charging error' and cannot charge properly on the dock.

Safety first: Unplug the dock from the wall before cleaning contacts. Do not use wet cloths on powered contacts.

• 1. Check power to dock:
  • Ensure the power adapter is firmly plugged into the dock and wall outlet.
  • Verify the dock indicator light (if present) is on.
• 2. Clean charging contacts:
  • On the robot and dock, gently clean the metal charging pads with a dry cloth.
  • For stubborn oxidation, lightly rub with a pencil eraser, then wipe clean.
• 3. Check alignment:
  • Place the dock against a wall on a flat surface.
  • Manually dock the robot and ensure the contacts touch evenly.
• 4. Inspect robot contacts:
  • Check that the spring-loaded contacts on the robot move freely.
  • If a contact is stuck or broken, the contact module may need replacement.
• 5. Test with another outlet or adapter:
  • If possible, test the dock with a known-good Xiaomi power adapter.
• 6. If still not charging:
  • The dock PCB or robot mainboard charging circuit may be faulty; replace the dock or mainboard as needed.