Cordless vacuum displays E4 and will not start or stops shortly after starting; often occurs after long use or in a hot environment.

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

• Let it cool: Place the vacuum in a cool, dry area away from direct sunlight. Do not cover the vents.
• Check for blockages: After cooling, inspect the floor head, wand, and dust bin inlet for clogs. Remove any debris.
• Clean filters thoroughly: Remove the pre‑motor and HEPA/post‑motor filters. Tap off dust and wash if the manual allows. Ensure filters are completely dry before reinstalling; damp filters restrict airflow and cause overheating.
• Inspect cooling vents: Check the motor housing vents for lint or dust buildup and clean gently with a soft brush or compressed air (short bursts, from a distance).
• Usage pattern: Avoid running the vacuum continuously on maximum power for extended periods. Use lower power modes for regular cleaning.
• If E4 persists: Repeated E4 with clean filters and clear airflow may indicate a faulty temperature sensor or motor. Professional diagnosis and replacement of the motor/NTC sensor assembly may be required.