Vacuum leaves lines of debris behind and does not pick up well from carpets, though suction at the wand seems normal.

Safety: Remove the battery and disconnect the floor nozzle.

• 1. Inspect bristles: Check the length and condition of the brush bristles. If they are worn down or uneven, replace the brush roll.
• 2. Verify rotation: With the nozzle attached and battery installed, briefly run the vacuum and observe the brush roll (keep fingers and clothing away). If it turns slowly or stops under light pressure, the motor or drive system may be weak.
• 3. Clean nozzle intake: Remove the brush roll and inspect the intake channel behind it for compacted lint or hair. Clear thoroughly.
• 4. Check height setting: If your Siemens nozzle has adjustable height, ensure it is set appropriately for carpet, not hard floor.
• 5. Replace nozzle motor (if needed): If the brush roll is in good condition but still lacks power, the nozzle motor may be failing and should be replaced.

Good brush contact with the carpet is essential for effective pickup; replacing worn rolls restores cleaning performance.