Sterra Flow — F1 Discharge High Temperature — LED Flashes Red and BlueUpdated a day ago
If your Sterra Flow digital display screen is flashing the F1 error code and the indicator lights are cycling between Red and Blue, please be completely reassured. This is a sign that your vacuum's advanced safety protocols are working exactly as they were engineered to do!
An F1 code indicates that the vacuum's microprocessors have deployed an Automated Thermal Protection Pause. The Sterra Flow features a highly advanced lithium-ion battery pack equipped with smart thermal sensors. When you use the vacuum under heavy loads—such as running it continuously on Maximum Suction Mode or vacuuming thick, high-pile carpets—the energy cells naturally generate heat. If the internal temperature reaches its safe operational ceiling, the vacuum instantly pauses its system to isolate the cells, allowing them to cool down and preventing any long-term wear or degradation to the battery life.
You can easily allow the system to stabilize and clear the active safety lock by completing this simple resting protocol:
The Thermal Stabilization Protocol
Please unplug the vacuum immediately and follow these simple cooling steps:
1.Completely Power Down and Isolate the Unit
If the vacuum is currently plugged into its wall charger, unplug it immediately.
Press the battery release latch and slide the entire battery pack completely out of the handle housing slot. This completely isolates the power cells and allows air to circulate around the hardware.
2.Allow the Battery Core to Rest in a Cool, Flat Space
Place the detached battery pack and the vacuum body on a flat surface in a cool, dry room away from direct sunlight, heating vents, or warm appliances.
Leave the unit entirely alone for 1 to 2 hours. This gives the tightly packed internal lithium-ion cells the necessary time to drop completely back down to ambient room temperature.
3.Reinsert and Verify the Safety Clear
Once the rest period is over and the battery feels completely cool to the touch, slide the pack firmly back into the vacuum handle guide rails until you hear a clean "click" sound.
Press the power trigger. The F1 safety memory loop will have registered the safe temperature drop, the flashing red and blue lights will vanish, and full suction power will be restored.
What to Do If the F1 Error Persists
For 95% of users, simply letting the battery core rest and cool down for 1 to 2 hours will instantly clear the safety pause, letting you get right back to your cleaning routine.
However, if you have allowed the unit to rest in a cool room for over two hours, but the display stubbornly continues to flash F1 the moment you click the battery back in, the internal smart thermal sensor or the battery pack itself may have experienced an permanent calibration fault.
Please log into our Customer Support portal to send a direct assistance message to our technical team.
Log in to our Customer Support Portal.
Submit a support ticket describing the issue.
Attach a short video (at least 1 minute long) showing the error happening. This will help our technical team diagnose and resolve the issue much faster for you.
📌 What to put in your support message: Let our team know: "My Sterra Flow is displaying an F1 error code with alternating red and blue flashing lights. I have already followed the Help Center guide to remove the battery pack and let the entire unit rest in a cool place for 2 full hours, but the thermal protection block will not clear."