Your model number can usually be found on a data plate on the back, side or underneath of the appliance.
Your model number will be a combination of letters and numbers, sometimes separated by a dash (-) or a slash (/).
If your dishwasher door is not properly locking, it sounds like it could be time for a new door lock.
ForMySpares has this compatible replacement lock that could soon be fitted to your dishwasher, to enable you to have a perfectly working dishwasher door again.