Vacuum shows E04 and runs only at reduced power or shuts off after a few seconds

Safety first: Turn off the vacuum and remove the battery. Allow the unit to cool for at least 30 minutes before further inspection.

• Check ventilation: Inspect all air vents around the motor housing and dust container area. Use a soft brush or vacuum to remove lint and dust from grills.
• Clean or replace filters: Remove the HEPA/post-motor filter and pre-motor filter. If the HEPA filter is heavily discolored or clogged, replace it with a genuine Bosch filter. Wash only if the manual explicitly states it is washable.
• Reduce load: Ensure there are no blockages in the nozzle, tube, or hose. Use lower power settings for long cleaning sessions to reduce heat buildup.
• Check for abnormal smells/noise: If you notice a burning smell or grinding noise from the motor, discontinue use. This indicates internal motor damage and the motor unit should be replaced.
• Test after cooling: Once filters are clean/replaced and vents are clear, reinstall the battery and test. If E04 appears quickly again, the temperature sensor or motor assembly is likely faulty and requires professional service.