Cordless vacuum will not turn on at all; no lights, no sound, even with a seemingly charged battery.

Safety first: Remove the battery and unplug the charger before any disassembly.

Steps to try:

• Verify battery charge: Place the battery on the Eureka charger and confirm the charger LED indicates charging. If no lights appear, suspect the battery or charger.
• Try another outlet/charger: Use a different wall outlet and, if possible, a known-good Eureka charger.
• Check trigger action: With the battery removed, pull the trigger and feel for a distinct click. If it is stuck, use compressed air around the trigger to clear debris.
• Inspect internal wiring (advanced): Open the handle/main body shell and inspect the wiring from the battery terminals to the trigger and main PCB. Look for loose connectors or broken wires.
• Component-level issues: If all wiring is intact and a known-good battery does not power the unit, the main PCB or internal fuse is likely blown. Replace the main control PCB or main body assembly.