Cordless vacuum shows E9 and immediately stops when the trigger or power button is pressed

Safety first: Immediately remove the battery pack. If the unit was exposed to liquids, do not attempt to power it on again until fully inspected.

• Inspect for liquid damage: Check the dust bin, motor housing, and handle for signs of moisture or sticky residue. If liquid was vacuumed accidentally, the motor and PCB may be damaged.
• Check wiring: Open the handle and wand (if applicable) to inspect for pinched or cut wires, especially where the wand pivots or locks. Repair or replace damaged harnesses.
• Smell test: If you notice a burnt electronics smell from the motor or PCB area, the component is likely shorted and must be replaced.
• Do not bypass fuses: Some Medion models include thermal fuses or electronic fuses on the PCB. Never bypass these; replace the faulty board or motor instead.
• Professional service: Due to fire risk, if E9 persists after visual inspection, have the vacuum serviced by a qualified technician.