How can i fix my drainage problem?

recently the water would not drain from my indesit WIDL 126S machine, I have done all the obvious checks, everything looks as it should be. after doing a little research somethings pointed to the pump maybe being past its life span. so i have replaced it, and still its not working. when machine is in cycle alams 2 and 4 flash, when drainage is required then machine stops what it is doing. when machine is selected for drainage only, door locks and few minutes later door unlocks with water still in machine. the machine is about 5 yrs old, is it time for a new one? or is there something else that may be worth checking?