If you already disconnected power, ensure that there is no water inside the machine. Then check drain well and filters, check inlet hose, and try restarting the machine.
If there are still problems, then the machine is faulty.
If the dishwasher is two years old, it is either in warranty , or the warranty has recently expired.
Frigidaire dishwashers have 2 years standard limited warranty on parts and labor.
If the machine is less than two years, have it repaired under warranty.
If it is over two years, call
Frigidaire - Customer Support at 1-866-386-5286 (toll free) , and try to purchase a warranty extension to five years, you may still be in time, and this will cover you toward any future problem.