Before there was hot water running through my dishwasher during the wash cycle, now there is only warm water running through the wash cycle. What is wrong with my dishwasher?

Your dishwasher is only connected to the hot water line in your home, most do not heat the water at all. It is a good idea to run the hot water in your sink for a minute or two to get the room temp water out of the line. Try that and then come back and tell us more