WM3470HVA LG washer will not drain during cycle, pump works fine, hoses are clear.

I have a front load LG washer manufactured in 2014. Yesterday I washed a load and when I went to throw it in the dryer I found water and soap on the floor and the drum still full of water. There is no error code showing up but the washer is not draining. I drained it manually, checked for clogged hose and cleaned the lint trap. There is no blockage and the lint trap was very clean as I clean it once a month. Did some searching and found a procedure to try on the LG website, as follows:

Press the POWER button to turn the washer on.
Press the RINSE & SPIN button.
Press the START/PAUSE button.
Wait for the washer to fill and begin the rinse agitation.
Press the START/PAUSE button to pause the cycle, then press the POWER button to turn the washer off.
Press the POWER button to turn the washer back on.
Press the SPIN SPEED button to select a high spin speed. This will perform a spin only cycle.
Press the START/PAUSE button.
The washer will begin to drain the water from the washer and will begin spinning.

Following this procedure the machine drains and spins fine, so the pump is working.
However if I just select the Rinse & Spin cycle and let it run the washer will fill and begin agitation, it will then normally drain some water and add more water while agitating for several minutes. This does not happen, the washer begins agitation and when it would normally drain there is no hum or anything then more water is added, it will keep adding water but none is drained.
I tried several different cycles and none will drain except when following the above procedure and going directly to a spin cycle. Seems to me the pump is not getting a signal (power) to allow it to drain. Sounds like a control board problem. Does anyone know how to check the board? Is there perhaps something else I'm missing?

Thanks

via WM3470HVA LG washer will not drain during cycle, pump works fine, hoses are clear.
by Sam Spade