E12
Lefant
Water Tank / Mop Module Detection Error
Robot vacuum reports E12 and stops, often when using the mopping function.
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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
Mop water tank not installed correctly, Water tank detection switch not actuated, Corroded water tank contacts, Faulty water tank sensor on mainboard
How to Fix / Troubleshooting
Safety: Turn OFF the robot and remove the water tank. Do not spill water into the robot body.
- Step 1 – Remove and inspect water tank: Check the tank for cracks, leaks, or deformed mounting tabs.
- Step 2 – Clean contacts and switch: If your Lefant model uses electrical contacts, wipe them dry and clean on both the tank and robot. If it uses a mechanical switch, ensure the tank tab fully presses the switch.
- Step 3 – Reinstall tank: Slide the tank straight in until it clicks. Confirm it is flush with the robot’s body.
- Step 4 – Test without water: Install the empty tank and start a mopping mode to see if E12 appears. If it works empty but fails when filled, check for leaks onto the sensor area.
- Repair: If the detection switch or sensor circuit is faulty, the water tank sensor or mainboard may need replacement.
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Repair Difficulty
Medium
3/5
Required Part
Water Tank Detection Switch
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