Every once in a while we have been challenged with trying to adjust a customer’s kitchen or bathroom cabinet doors that will not close. There are several reasons for this. Perhaps I can address your particular situation and offer a solution to the problem.
If you are working with a “freestanding” cupboard that is not fastened to the wall, your problem could be that the cabinet is racked out of kilter. Push on the top left or right side of the unit and see if it helps the situation any. If it does, you will need to place shims underneath the bottom of one corner of the cabinet. This is going to be a process of trial and error to get the unit situated correctly. If it is setting on carpet, the culprit may be the tack strip that is installed right next to the wall.
The Door Closes But One Corner Sticks Out
This particular situation usually involves the top or bottom hinge being adjusted too far out or in. If it is the top corner of the door that is sticking out, then either the top hinge needs to be adjusted in toward the cupboard face or the bottom hinge must be moved out away from the cabinet face.
The Entire Edge of the Door Sticks Past the One Next to it
Another possible situation might be that when the cabinet door is closed it has a tendency to slightly reopen along the entire edge of the door. If this is the case, both hinges may need to be adjusted toward you, away from the cabinet face. What is happening is the inside of the door is binding on the cupboard face and will not allow it to close completely.