E12
LG
Battery Overtemperature / Thermistor Fault
Robot vacuum reports a battery temperature or overheat error (E12) and shuts down during or after charging.
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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
Blocked ventilation around robot or dock, Failing battery pack generating excess heat, Faulty battery temperature sensor (thermistor), Defective charge control circuit
How to Fix / Troubleshooting
Safety first: If the robot or battery feels very hot, unplug the dock and allow the unit to cool completely before handling. Do not puncture or open the battery pack.
- 1. Improve ventilation: Ensure the dock is not inside a cabinet or against a heat source. Provide open space around the robot while charging.
- 2. Allow cooling time: Let the robot sit powered off for at least 30–60 minutes, then try charging again.
- 3. Inspect battery pack: Remove the battery cover and check for swelling, discoloration, or a burnt smell. If any are present, discontinue use and replace the battery pack.
- 4. Check for dust buildup: Clean dust from vents and around the battery compartment to improve heat dissipation.
- If the error recurs with a new, genuine LG battery and proper ventilation, the battery thermistor or charge control circuit on the main PCB may be defective and should be serviced professionally.
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Repair Difficulty
Hard
4/5
Required Part
Battery Pack with Thermistor
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