Cordless vacuum shows E4 and will not start or stops abruptly, sometimes accompanied by a burning smell.

Safety: Turn off the vacuum, remove the battery, and allow the unit to cool for at least 30 minutes before handling.

• Inspect for overheating signs: Check for discoloration or melting on the motor housing or vents. If you see melted plastic or strong burnt odor, discontinue use and contact a technician.
• Clean all filters: Remove and clean pre-motor and HEPA filters as per the user manual. Ensure they are completely dry before reinstallation.
• Clear vents and air paths: Use a soft brush to remove dust from all visible vents and grills on the motor unit.
• Reduce load: When testing, start on the lowest power setting and avoid using turbo mode continuously for long periods, especially on thick carpets.
• If E4 persists: The thermal sensor or motor windings may be damaged. Continued use could be unsafe; have the motor assembly inspected and replaced if necessary.