My washing machine will not drain, we have taken this apart and cleaned it, there is nothing clogged in any of the lines. If you pull the drain hose down to ground level the water will come out but if it is in the wall it will not drain. You can hear the pump running and feel a some pressure from the hose with your hand. Does anyone know what might be the cause of my washing machine not draining. It does agitate and wash with no issues just won't drain.