Vacuum runs for 1–3 seconds then stops; LED flashes in an E4 pattern and unit will not stay on.

Safety first: Remove the battery pack. Do not open the motor housing if the unit is under warranty; this may void coverage.

• Rule out simple causes: Remove all accessories and filters, then reinstall the battery and briefly test. If the same behavior occurs with clear airflow, the fault is likely electronic.
• Check for moisture: Inspect the exterior of the motor housing for signs of liquid spills or condensation. If the vacuum was used to pick up liquids (not allowed on most Makita cordless vacuums), stop using it immediately and allow it to dry in a warm, dry area for at least 48 hours.
• Do not bypass safety circuits: Never attempt to bridge or short any terminals to keep the motor running; this is dangerous and can cause fire.
• Service recommendation: This error typically requires replacement of the motor housing assembly, which includes the control PCB and motor. Contact a Makita service center and provide the model number and serial number for correct part identification.