Vacuum shows F6; LED battery indicator behaves erratically (jumps from full to empty)

Safety first: Remove the battery before cleaning contacts.

• Step 1 – Clean and reseat battery: Wipe the battery and body contacts with a dry cloth. Reinstall the battery firmly until it clicks.
• Step 2 – Full discharge and recharge: Run the vacuum until it shuts off, then fully recharge without interruption. This can recalibrate the fuel gauge on some Toshiba packs.
• Step 3 – Test with another battery: If available, test with a second pack. If F6 disappears, the original battery’s gauge circuit is faulty.

When to call a technician: Persistent F6 with multiple batteries suggests a main PCB communication issue. Professional service is recommended.