LG Washing Machine 1E Error - Two Different Machines, Same Problem. What Am I Missing?

TL;DR: Got 1E error on my LG washer, bought a new machine, same error on first run. Water pressure is fine, dishwasher upstairs works perfectly.

My LG washing machine was working perfectly until it suddenly threw a 1E error (water supply issue). I checked everything I could think of water pressure, hoses, connections, everything seemed fine from the supply side(Robinhood Supertub). After troubleshooting for a while, I figured the machine was just old and decided to buy a new LG washer. Same exact 1E error on the very first cycle.

What I’ve tried: Replaced all the water supply hoses going into the machine. Verified water pressure is good throughout the house. Dishwasher runs perfectly. Never had this problem before in this house.

Has anyone encountered this before? What obvious thing am I probably overlooking? Thanks in advance!