Cordless vacuum will not turn on at all; no lights or response when pressing power

Safety first: Inspect only with the battery removed and charger unplugged.

• Verify charging: Place the vacuum on the charger or dock and confirm that the charger LED or vacuum charge indicator lights up. If there is no indication, test a different outlet and inspect the charger cord for damage.
• Test battery: If possible, try a known-good Bissell battery in the vacuum. If the unit powers on, replace the original battery pack.
• Check battery seating: Ensure the battery is fully inserted and latched. Remove and reinstall it firmly.
• Inspect power switch: If the unit has a mechanical power switch, feel for a positive click. A loose or mushy switch may have failed and require replacement along with the UI board.
• Board-level fault: If a good battery and charger are confirmed and the unit remains dead, the main control board or internal wiring is likely faulty. Replacement of the main body or PCB is required and is best done by a technician.