Cordless vacuum will not start; LED shows E4 or four red flashes when trigger is pulled

Safety first: Turn OFF the vacuum, remove the battery pack, and allow the unit to cool.

• Cool-down: Let the vacuum sit powered off with battery removed for at least 30–45 minutes in a cool, dry area.
• Inspect vents: Check all motor cooling vents on the main body for lint and dust buildup. Use a soft brush or compressed air (short bursts, from a distance) to clear them.
• Check for blockages: Confirm that the dust cup, filters, wand, and nozzle are not clogged, as restricted airflow can cause overheating.
• Test on low power: Reinstall the battery and run the vacuum on the lowest power setting. If it quickly shuts off again with E4, the motor’s thermal sensor or windings may be failing.
• Service recommended: Motor and thermal sensor replacement in Hamilton Beach cordless vacuums typically require disassembly of the main body. Contact a qualified technician or Hamilton Beach service center.