Common dishwasher troubles generally stem from poor water circulation, drainage blockages, or heating failures. When dishes come out grimy or covered in fil, it's often due to clogged spray arm nozzles or a dirty mesh filter preventing fresh water from reaching the load. If the unit fails to drain, the culprit is usually a buildup of food debris in the sump or a kinked drain hose, while a lack of drying typically points to a burned-out heating element or a faulty rinse aid dispenser. Additionally, leaks around the base are frequently caused by a worn door gasket or using the wrong type of detergent, which can create excessive suds that bypass the seals.