Bosch cordless vacuum stops and displays E03, often when using motorized floor nozzle or turbo brush

Safety first: Remove the battery pack and disconnect the motorized nozzle from the vacuum before working on the brush.

• Remove brush roll: On most Bosch cordless nozzles, unlock the side cap or release latch and pull out the brush bar.
• Clean thoroughly: Cut away hair and threads with scissors, taking care not to cut bristles. Remove any wrapped fibers from the ends of the brush where they sit in bearings.
• Check for obstructions: Inspect the nozzle air path and brush chamber for coins, toys, or large debris. Remove anything blocking rotation.
• Inspect brush bearings: Spin the brush roll by hand. It should rotate freely. If it feels rough, seized, or melted at the ends, the brush roll assembly should be replaced.
• Check electrical contacts: Inspect the nozzle’s electrical connector pins and the mating contacts on the tube/handle for bent or burned pins. Clean gently with a dry cloth.
• Reassemble and test: Refit the brush roll and reconnect the nozzle. Reinstall the battery and test on low power first. If E03 persists with a clean, free-spinning brush, the nozzle motor or internal PCB is likely faulty and the entire motorized nozzle may need replacement.