It will probably be the pressure chamber/fill hose bunged up. This is sited on the LHS as you look at the appliance. If you can get to it and watch it , you may see the red float bobbing up and down as water enters the machine….it shouldn’t do this !!! The pressure chamber (The component the red float sits in ) and the ribbed fill hose leading from this into the sump , if blocked , will cause water to back up and operate the flood protection device ( The red float ) which thens shutd the valve off quickly and pumps a little water out.
As to the model number , it should be chemically etched onto the top edge of the inner door and is quite difficult to see. It depends on the angle you look at it ! MAke sure the metal is clean or you won’t see ‘owt .
POWER OFF AND PLUG OUT IF INVESTIGATING