Vacuum display shows E9 and unit will not start; often after being stored in a cold or hot environment.

Safety first: Do not operate or charge the vacuum if the battery feels very hot or very cold to the touch.

• Normalize temperature: Bring the vacuum and battery indoors to room temperature (20–25°C / 68–77°F). Let it sit unplugged for at least 1 hour.
• Avoid direct heat: Do not place the battery near heaters or in direct sunlight to warm it. Allow it to warm or cool naturally.
• Retry operation: After the rest period, reinstall the battery and attempt to power on. If E9 clears, resume normal use but avoid extreme temperatures.
• Persistent E9: If the error remains at room temperature, the battery’s internal temperature sensor or wiring may be faulty. Replace the battery pack with a genuine Insignia replacement.