This usually indicates that during the unloading process of the CFS lite, the CFS lite Feeding Motor is unable to rotate properly, while the Filament Sensor in the Toolhead still detects filament. Common causes include:
Abnormal resistance in the PTFE tube, causing excessive resistance and preventing normal filament retraction;
The extruder is clogged, causing the filament to get stuck and unable to exit.
First, check whether the PTFE tube is excessively bent, kinked, or too long, resulting in high resistance that prevents proper unloading. You can refer to: CFS Lite Filament Tube Installation and Placement Guidelines
Open the Extruder Lever on the right side of the Toolhead. You can then observe the filament condition at the Extruder Gear. If there is a clear clog, remove the front cover of the extruder and clean the Extrusion Assembly. Refer to: SPARKX i7 Extruder Cleaning and Maintenance Guide