Vacuum displays E9 and runs only at low power or shuts off under load

Safety first: If the battery feels very hot, remove it carefully and place it on a non‑flammable surface away from flammable materials. Do not cover it.

• Step 1 – Allow cooling: Let the battery cool to room temperature (at least 30–60 minutes). Do not place it in a refrigerator or freezer.
• Step 2 – Check vents: Inspect the battery compartment and surrounding vents for dust buildup. Clean with a dry cloth or compressed air (short bursts, from a distance).
• Step 3 – Avoid heavy use in turbo mode: If E9 appears only in turbo mode on thick carpets, reduce usage time in that mode and allow cooling breaks.
• Step 4 – Test again: After cooling and cleaning, reinstall the battery and test. If E9 appears immediately from cold, the temperature sensor or BMS is likely faulty.

When to call a technician: Recurrent E9 with a cool battery suggests a defective temperature sensor or BMS. Replace the battery pack with a genuine Toshiba pack or have it tested professionally.