HI i have just purchased a second hand Bosch machine. On trying it out everything seemed fine until water was draining out of machine. Water was overflowing onto floor. On closer inspection i could see at the back of the machine the water was overflowing out of the drainage pipe? Any ideas why this would happen? Do i need a special pipe? I have just used the same one as my last machine i put the pipe inside the drainage tube. Any got any help please.