Thank you for your question and I understand your concern.
The "LF" fault code will display if the water level does not change for a period of time or if water is present but the control does not detect the water level changing. After you noticed the drain hose was stuffed way down the stand pipe and you pulled it up so that only 6 inches is stuck down the pipe, I assume you started the cycle over to see if will fill. If you can confirm good water flow (hot and cold) and the water level is changing and the "LF" fault code continues to display then I recommend calling and scheduling a service appointment if this is a new washer. If it's not a new washer I added two images below with some information that a service technician would use to diagnose the failure. It could have a pinched or restricted water lever pressure switch hose. I recommend checking the pressure switch hose first for any blockages or holes in the tubing before following the troubleshooting information I added in the images below.
NOTE: Disconnect the power cord before accessing and checking the connections and pressure switch hose.
If you do not feel confident repairing this problem yourself, then you can have it repaired at your home by a Sears technician. Here is a link for the website:
Sears Home Services