Battery indicator flashes a specific F1 pattern and the vacuum will not start even though the battery was recently charged.

Safety: Inspect the battery for swelling, cracks, or leakage. If any are present, do not use the battery and contact service immediately.

Recovery attempt:

• Place the battery on the original Gorenje charger and leave it for several hours, even if LEDs do not behave normally at first.
• After charging, remove and reinsert the battery into the vacuum and test.

If F1 persists and the vacuum will not run, the battery pack is likely below safe operating voltage or damaged. Replace the battery pack with a genuine Gorenje replacement.