Samsung dishwasher Doesn't Drain

Samsung DW80K7050US about 6 years old. Dishwasher Doesn’t Drain…drain hose not plugged, changed drain pump (it was making a horrible humming noise), removed and cleaned everything in the tub, changed inner drain hose (it was cracked at the fitting). Have not recently installed anything…sump pump works, water gets to drain pump but does not get to the drain hose outlet. Something - a solenoid or a blockage in that white plastic housing that the inner drain hose and sink drain hose connects to? Should I change that part? Thanks!!

Hello. Did it show any failure code?

That was me posting…sry I wasn’t logged in. Looking for where the check valve is and a replacement part if anyone knows …