Cordless vacuum shows F4; unit may start and stop rapidly (pulsing) with low suction.

Safety first: Turn OFF and remove the battery before disassembling the air path.

• Remove and inspect cyclone: Take out the cyclone assembly from the dust bin. Check the small cyclone holes and mesh for packed dust. Use a soft brush to clean thoroughly.
• Check inlet grill: Look at the grill where air enters the cyclone from the bin. Remove any clumps of dust or hair.
• Inspect hose and wand: Detach the wand and any flexible hoses. Look through them and push out any blockages with a long, blunt object (like a wooden dowel). Do not use sharp tools.
• Verify filter placement: Ensure the pre‑motor filter is seated correctly and not folded or misaligned, which can restrict airflow.
• Reassemble and test: After cleaning, reassemble all parts and test on low power first. If F4 persists, there may be a hidden blockage near the motor inlet that requires professional service.