When your dishwasher door has a problem, check these:LatchSpringsHingesDoor seal
latch on many dishwashers is adjustable. If your door is easy to close
but difficult to latch, adjust the latch to let the door close more
easily. If you can't see any way to adjust the latch, yours may be
fixed in a certain position. Check for other reasons for the latching
If the latch has worn out in a way that makes it
impossible for you to close the door properly, you probably need to
replace the latch.
dishwasher has two springs that counterbalance the weight of the door.
If either or both of these are broken, the door feels quite heavy and
you need to replace both springs.
hinges are important to the door closing properly. If they're bent or
deformed, you probably need to replace them. Once bent, only rarely can
they be straightened well enough.
your dishwasher is new--or if you have just replaced a door seal--the
door may be difficult to latch for a week or two. If the tightness
persists, though, try adjusting the latch, if it's adjustable. If it's
not adjustable, there's probably nothing you can do immediately. But
try running the dishwasher on the highest heat cycle to help the seal
conform to the door. Otherwise, the seal should compress over time.