Check the water level selector switch. Don't know why, but have seen one with a bad connection there and it fixed the problem. May not help, but just a thought.

I think I found the pressure switch. I will check it in a minute.

I have been using a LG Washer service manual to troubleshoot the issue but for some reason I cannot get it to upload to this website. Anyway, in there it shows a table on page 38 that states the ohm readings for checking the noise filter. And it states the following:

Test Points Result
WH (1) to RD (3) 0 Ω
WH (3) to RD (1) 0 Ω

But if I look at the schematic for that circuit just above the table on page 38, it doesn't look like there would be zero ohms between either of those sets of test points. There would be some other components (capacitors, resisters, and/or inductors between those test points. I do get zero ohms between W1-R1 and W3-R3. Is the manual incorrect? A copy of the page is attached.

The pressure switch is reading slightly high according to the manual. The manual states 21-23 ohms; it is reading 24.9 but fluctuates between 23.8 and 24.9 when different readings are taken. Picture from manual is attached.

I order some part and will see how it goes..