Cordless vacuum cuts out; red LED flashes three times repeatedly, often when using turbo/boost mode.

Safety first: Remove the battery pack and empty the dust container before servicing. Allow the unit to cool for at least 30 minutes if it feels hot.

Restore airflow:

• Empty the bin: Detach the dust canister and empty it completely. Tap gently to dislodge compacted dust from the cyclone shroud.
• Clean pre-motor filter: Locate the pre-motor filter (usually foam or fabric inside or above the dust bin). Remove it and tap it gently outdoors. If washable (check the Hoover manual/label), rinse under lukewarm water until clear, then squeeze out excess water and allow to air dry for at least 24 hours before refitting.
• Clean HEPA/post-motor filter: If your Hoover cordless has a rear HEPA or post-motor filter, remove and tap off dust. Only wash if explicitly marked washable. Replace if heavily clogged or damaged.
• Check for blockages: Inspect the wand, flexible hose (if fitted), and floorhead for clogs. Use a broom handle or similar to gently push out any compacted debris.
• Inspect cooling vents: Look around the motor housing for cooling slots. Remove lint and dust with a soft brush or vacuum.
• Reassemble and test: Once all filters are completely dry, reassemble and test on normal power first. Avoid running continuously on turbo mode in very dusty conditions.

If E3 continues: The thermal sensor or main motor may be failing. Continued overheating can permanently damage the motor; seek professional service for motor or PCB replacement.