Battery LEDs flash rapidly when trying to charge, charger LED blinks error pattern, battery will not accept charge

Safety first: Do not attempt to open the battery pack or charger. If the battery is hot, swollen, or leaking, isolate it on a non-flammable surface and contact a recycling facility.

Steps to diagnose charging fault:

• 1. Cool the battery: If the pack feels warm or hot, allow it to cool to room temperature for at least 1 hour before attempting to charge again.
• 2. Check the charger: Inspect the Hoover Candy charger cable and plug for damage. Plug into a different outlet. If the charger LED never lights with any battery, replace the charger.
• 3. Inspect contacts: Examine the battery's charge contacts and the charger's mating contacts for corrosion, burning, or deformation. Clean gently with a dry cloth.
• 4. Try a second battery (if available): If another compatible Hoover Candy battery charges normally on the same charger, the original battery pack is likely defective.
• 5. Replace the battery pack: If the error persists with a known-good charger and the battery never begins a normal charge cycle, replace the complete battery pack with an OEM Hoover Candy unit.

If a new battery and charger still show E6 behavior, the fault may be in the vacuum's internal charge control circuit (on models that charge via the dock). This requires professional diagnosis.