Cordless vacuum has very weak suction, even though the motor runs and there are no error codes.

Safety: Remove the battery before deep cleaning internal air paths.

• 1. Thoroughly clean dust bin and cyclone: Remove the bin and cyclone assembly. Disassemble according to the Siemens manual. Tap out dust and use a soft brush to clean all cyclone cones and mesh screens.
• 2. Inspect seals and gaskets: Check the rubber gasket around the bin and at the connection to the motor housing. Replace if cracked, flattened, or missing.
• 3. Check wand and nozzle: Shine a light through the wand and nozzle. Use a flexible rod to clear any partial obstructions, especially at bends and joints.
• 4. Verify filter condition: Even if not visibly dirty, heavily loaded filters can restrict airflow. Clean or replace pre-motor and HEPA filters as per Siemens recommendations.
• 5. Test with minimal configuration: Run the vacuum with only the main body and bin (no wand/nozzle). If suction is strong here but weak with accessories, the restriction is in the wand or nozzle.

Persistent weak suction after these steps may indicate internal leaks or a damaged cyclone assembly that should be replaced.