Cordless vacuum shows E4 and shuts down after a short run, body feels warm to the touch.

Safety first: Remove the battery pack and allow the vacuum to cool for at least 30 minutes before inspection.

Restore airflow:

• Empty and clean bin: Remove the dust container, empty it, and brush or tap dust off the cyclone mesh/shroud.
• Clean pre‑motor filter: Remove the pre‑motor filter. Tap gently outdoors to remove dust. If the manual permits, rinse under lukewarm water without detergent, squeeze out excess water, and air‑dry for 24 hours.
• Clean HEPA/post‑motor filter: If fitted, remove the HEPA filter. Tap gently to remove dust. Only rinse if the label states it is washable. Allow to dry completely before refitting.
• Check vents: Inspect the air vents around the motor housing and handle. Use a soft brush or vacuum to remove lint and dust.

Re-test: Once all filters are completely dry, reassemble the vacuum, refit the battery, and test on low power first. If E4 no longer appears, the issue was overheating due to restricted airflow.

If E4 returns quickly: The thermal cut‑out may be tripping due to a failing motor or faulty temperature sensor on the motor PCB. Professional diagnosis and likely motor assembly replacement are recommended.