LG F1443KD Series - Washer Operation Errors; Softener Issues

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Power off for 10sec. Then power on.
Is the water level over reference line and is the water level frequency 21.8khz?
* Water level frequency
- Press and Hold 'Prewash' & 'Temp'
simultaneously.
Data view type: ‘040’
FE (Overflow Error)
If FE is displayed again,
then replace the Pressure Switch.
If FE is displayed again,
then replace the Main PCB.
Drain out the water and then
Check the Air Chamber and the Tube (clogged).
NO
NO
YES
YES
Is the water coming in
drawer continuously?
Replace the Main PCB.
Replace the Inlet Valve assembly.