LG Front Load Washing Machine - Why is water supply not enough even when hydraulic pressure is normal?

Why is water supply not enough even when hydraulic pressure is normal?

  Cause

          ■ Even with normal hydraulic pressure, amount of water supply into the tub will be not sufficient if inlet filter is clogged, and 
             relatively higher noise due to a electrical motor can be heard.

  How to fix

          ■ Please clean the inlet filter .

         1) Close the water tap and unplug the power cord.

           2) Remove inlet hose by turning it counter clockwise and take out the filter out of washing machine.

           3) Clean the inlet filter with a toothbrush in running water.

           4) Reassemble parts in order.