I'm about done with this unit and I'm ready to throw in the towel and pay a professional.
We have an LG WD-8015C washing machine and for the last six months it's been having problems draining.
I can hear the pump spinning but no water flows. I can fix this by taking the drain hose out of the standpipe and blowing air back up the hose. As I do this I feel brief resistance that gives way and the pump immediately goes to work and drains the machine.
My standing theory has been that there's an air lock forming in the drain pump. To troubleshoot this I've stripped down the drain pump, the drain bellows and the filter assembly, looking for a cause. I've found none.
So this has been frustrating, doing a load of washing necessitates hanging about the machine and waiting for it to attempt to drain (it does this several times on some cycles) clearing the blockage when required.
We may as well wash by hand. I've had enough, the wife's had enough and I'm too stubborn to have someone else try and fix it.