Vacuum shows E12 or a filter icon; suction drops and unit may pulse on and off.

Safety first: Turn off the vacuum and remove the battery.

• Remove the dust bin and take out the HEPA/post-motor filter and any pre-filters.
• Tap filters gently against the inside of a trash can to remove loose dust. If the manual allows, rinse with cold water only and do not use detergents.
• Allow filters to air-dry completely for at least 24 hours before reinstalling. Never use the vacuum with wet filters.
• Check that the filter seals are intact and that the filter is fully seated in its housing.
• If E12 persists with clean, dry filters, replace the HEPA filter cartridge with a genuine Roidmi part.