Cordless vacuum will not start, red LED flashes once repeatedly when trigger is pulled

Safety first: Turn the vacuum OFF, remove the battery pack from the vacuum, and disconnect the charger from mains before inspecting anything.

Steps to try:

• Fully recharge the battery: Insert the Hoover battery pack into the OEM Hoover charger. Allow it to charge uninterrupted for at least 3–4 hours or until the charger indicator shows full (usually solid green). Do not use third‑party chargers.
• Check battery contacts: Inspect the metal terminals on both the battery and the vacuum handle for dirt, corrosion, or burn marks. Clean gently with a dry cloth. If there is light oxidation, use a cotton swab slightly dampened with isopropyl alcohol and let it dry completely.
• Reseat the battery: Slide the battery in firmly until it clicks. A loose fit can trigger undervoltage errors even with a good battery.
• Cool down the pack: If the vacuum was used heavily, let the battery cool for 30 minutes at room temperature, then try again. Overheated packs can temporarily read as low voltage.
• Test with another battery (if available): If a second Hoover-compatible battery works normally, the original pack is likely failing internally and should be replaced.

When to stop: If the E1 indication persists after a full charge and cleaning contacts, the internal BMS or cells are likely faulty. Do not attempt to open the battery pack; replace it or contact a Hoover service center.