Safety first: Unplug the charger from the wall before inspecting it. Do not use damaged power cords.

Inspect charger and cable: Look for cuts, kinks, or burn marks on the cable and adapter. If damaged, stop using it immediately.
Check charging contacts: On dock-style chargers, clean the metal contacts on both the dock and vacuum with a dry cloth. Ensure no debris is wedged in the port on plug-in models.
Test outlet: Plug another device into the same outlet to confirm it has power.
Try another charger (if available): Use a genuine Eufy charger with the same voltage and current rating. If charging works with the second charger, replace the original.
Observe charging behavior: Place the vacuum on the dock or plug in the charger. LEDs should indicate charging steadily. If E8 appears immediately, the internal charging circuit or battery BMS may be faulty.
Service required: If multiple chargers and outlets fail, the internal charging PCB or battery pack must be replaced by a technician.

Vacuum shows E8; LED indicators may flash; unit may not charge or may stop charging prematurely.

Possible Causes