Vacuum shows F3; runtime is extremely short and unit may shut off abruptly

Safety first: Do not attempt to open the battery pack. Damaging lithium‑ion cells can cause fire or injury.

• Step 1 – Perform a full charge: Charge the battery uninterrupted until the charger indicates full. Leave it on the charger for an additional 30–60 minutes to allow cell balancing (if supported by the BMS).
• Step 2 – Avoid turbo mode: Test the vacuum in normal or eco mode only. If runtime is still very short (e.g., under 3–5 minutes), the pack is likely at end of life.
• Step 3 – Try a second battery: If available, test with another Toshiba battery. If the second pack works normally, replace the original battery.

When to call a technician: F3 indicates the battery pack is no longer healthy. Replace it with a genuine Toshiba pack. If a new pack also shows F3, the BMS communication or main PCB may be faulty and needs professional diagnosis.