Vacuum runs but has very weak suction, even with a clean filter.

Safety first: Remove the battery before inspecting for cracks or leaks.

• Inspect hose: Flex the Hilti hose along its length while blocking the end with your hand during operation (briefly, with battery installed). Listen for hissing indicating leaks. Replace the hose if cracked.
• Check hose connections: Ensure the hose is fully inserted and locked into the inlet and accessories.
• Inspect container seals: Check the lid gasket and any container seals for damage or misalignment. Replace worn gaskets.
• Check for internal blockage: Remove the hose and look into the inlet and around the filter cage for debris restricting airflow.