Vacuum Cleaner Troubleshooting before Placing an Order: ① No charging light, but works normally → Damaged battery or charger. ② Red light flashes 3-5 times when charging → Battery error; replace battery. ③ Fully charges in minutes but dies quickly → Old/battery aging; replace battery. ④ Solid red light (no flashing) when charging → Motor failure; replace motor. Note: Replacing the charger won’t fix battery or motor issues.