This machine has worked without any problem for 6 years. Virtually every time we used the machine we would use the normal cycle selection (No.2 ) The machine would make a sort of humming noise for a little while and then you’d hear the water coming in.
Recently when you start the cycle there is a sort of crunching /crackling noise over the hum until the water comes in and then it sounds like it always has.
Maybe something in the drain pump area.
Access is by removing filters and looking at the LHS of the sump recess to locate a torx 20 screw.
Remove the cover that, that screw is holding and see if anything is in there that shouldn’t be.
Bearing in mind it may be glass ❗