Vacuum shows F4 and the brush roll does not spin, although suction is present.

Safety first: Remove the battery pack and detach the motorized floor nozzle before inspection.

• Step 1 – Check mechanical rotation: Spin the brush roll by hand. It should rotate freely. If it is jammed, clear debris or replace the brush roll before suspecting electronics.
• Step 2 – Inspect cable and connectors: Examine the electrical connector between the nozzle and tube/handheld unit for bent pins, broken plastic, or loose fit. Inspect the cable along the tube (if external) for cuts or kinks.
• Step 3 – Test with another nozzle (if available): If you have a second motorized Severin nozzle, connect it and test. If the second nozzle works, the original nozzle's motor or PCB is faulty.
• Step 4 – Clean contacts: Wipe the nozzle and tube contacts with a dry cloth to ensure good electrical connection.
• Step 5 – Replace nozzle assembly: Internal Hall sensors and brush motor PCBs are not usually serviceable separately. Replace the complete motorized floor nozzle if F4 persists only with that nozzle.