Is the machine over filling then.Can you see it getting above the top of the door glass?
on the back of the filter is an air chamber.this has a black hose that goes up to the pressure switch.the air chambers get blocked with gunk and scale and allow the machine to over fill.sometimes the black hose wears a hole through it and causes the same issue.You can clean the air chamber on the back of the filter housing but it is tricky.Sometimes fitting a whole new filter housing is as easy for cost
CK
February 2013