Safety first: Remove the battery to prevent discharge and avoid leaving the unit unattended.

Power reset: Remove the battery for several minutes, then reinstall and check if the LEDs behave normally.
Inspect for moisture: Check the nozzle for signs of liquid. Allow to dry thoroughly if moisture is present.
Test with another nozzle: If available, connect a different Kärcher nozzle. If the issue disappears, the original nozzle PCB is faulty.
Replace nozzle: Replace the powered nozzle assembly if the LED driver is stuck on.

Cordless vacuum’s LED work light stays on even when the vacuum is switched off

Possible Causes