E9
Medion
Battery Temperature / Overcurrent Protection Error
Robot vacuum displays E9 and may shut down unexpectedly, often related to charging or runtime issues.
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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
Overheated battery pack, Faulty battery temperature sensor (NTC), Shorted battery cell, Defective charging circuit on mainboard
How to Fix / Troubleshooting
Safety first: If the robot or battery feels hot, turn it OFF immediately and remove it from the charging base. Allow it to cool in a non-flammable area. Do not puncture or open the battery pack.
- Step 1 – Cool down: Let the robot sit powered OFF for at least 30 minutes. Then place it back on the dock and monitor for abnormal heating.
- Step 2 – Check environment: Ensure the charging base is in a cool, well-ventilated area away from direct sunlight or heaters.
- Step 3 – Inspect battery: Remove the battery cover and visually inspect the Medion battery pack. If it is swollen, leaking, or smells burnt, discontinue use and replace it immediately.
- Step 4 – Check NTC sensor wiring: Many Medion packs include a temperature sensor wire. Ensure the battery connector is fully seated and that no sensor wires are broken.
- Step 5 – Replace battery: If E9 persists and the pack shows signs of age (short runtime, frequent shutdowns), replace the battery pack with a compatible Medion Li‑ion pack.
- Step 6 – Mainboard diagnosis: If a new battery still triggers E9, the charging/monitoring circuit on the mainboard may be defective and should be replaced by a technician.
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Repair Difficulty
Hard
4/5
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