Cordless vacuum shows F7 and runs only for a few seconds before shutting off

Safety first: Remove the battery before inspection.

Steps:

• Fully charge: Place the battery on the original Hoover charger until the indicator shows full. Then leave it an extra 30 minutes.
• Run-time test: Time how long the vacuum runs on normal mode from full charge. If it stops within a few minutes and F7 appears, the battery is worn out.
• Try another battery: If available, test with a second Hoover battery. Normal operation with the second pack confirms the original battery is faulty.

Resolution: Replace the battery pack with a genuine Hoover lithium-ion battery. Do not continue using a pack that repeatedly triggers F7; it may fail completely.