First action after starting the programme should be for the drain pump to run. A foreign bdoy rattling round in the drain pump can make some interesting noises, or jam it all together.
I also have this problem.
If I open and close the door during the humming noise the machine starts heating the water and making a grinding noise but the blades won’t turn. I have checked that they can and that they are not blocked. I have also checked the machine takes water and drains.
Any ideas would be appreciated!