My unit will empty about half. I checked the pump.. nope, I checked the timer by watching a clock and comparing to the designed timing cycles... no problem
I blew air in the drain line... seemed like no issue
Problem went away and then came back a week later?
I took the drain line out and found a pistachio shell in the drain line. It was acting like a check valve. When water flowed it would pivot in the line and close it off. LOL
removed it.. all good