Need to know what a code coming up means!

The FE error code on this washer stands for an overfill error. Water is overflowing (water level frequency is over 213). If displayed, the drain pump will operate to drain the water automatically. So if you water inlet valve is sticking in the open position causing the unit to fill with water it will cause this error code. Seems like the inlet valve is a common issue on these washers. Have you noticed that the washer fills with water when off? Or overfilled? If so you could need a new inlet valve. There are two valves. If you can determine which one is sticking replace that one. The cold water valve is the triple valve. Here is the steps listed for this error code in the LG service guide. I have attached a repair video and links to the valves to assist you.

When you press both CUSTOM button and PRE-WASH button simultaneously, is the water level frequency below 24.6 kHz? IF yes then Check the AIR CHAMBER and the tube (clogged).
Is filter inlet valve clogged with foreign material? If so Clean or replace the filter.
Is the connector connected to inlet valve assembly disconnected or disassembled?
Is resistance between each terminal of INLET VALVE ASSEMBLY 0.8-1.2 kΩ? (Refer to 9-5 inlet valve assembly). If not with in range replace inlet valve assembly.
Is the voltage of the inlet valve connector 120 V AC? (Check the all terminal of INLET VALVE ASSEMBLY while the power is on.) If so Replace the INLET VALVE ASSEMBLY.
Is the connector connected to MAIN PWB assembly disconnected or disassembled?(NA4, BL3, BL4) IF so Reconnect or repair the connector.
Is Electrical connection correct? (Refer to 9-5 wiring diagram) IF not Replace the MAIN HARNESS
After checking connector, is the water level frequency below 24.6 kHz?
If so check the pressure switch.
IF not Replace the MAIN PWB ASSEMBLY.