Vacuum works normally on low power but cuts out or shows error lights when switched to max power.

Safety first: Remove the battery before cleaning or inspecting electrical contacts.

Steps to try:

• Clean filters and airflow: Ensure maximum airflow by cleaning filters and clearing blockages.
• Check battery age: Older batteries may not support max power. Test with a newer or known‑good Gtech battery if possible.
• Inspect contacts: Clean and reseat the battery to minimise voltage drop at the connection.
• Limit use of max: If the vacuum only cuts out on max with an older battery, replace the battery or use max mode sparingly.
• Service if needed: If a new battery does not resolve the issue, the motor or controller may be failing and the main body may need replacement.