Your dishwasher reduces the amount of cleaning you need to perform after large family meals. But with improper or excessive use, water may start to leak from the appliance. Before hiring a technician to inspect and fix the machine, perform some troubleshooting techniques. The Water Inlet Valve The water inlet valve, wash arm assemblies, and seal are critical parts that may have become damaged and require replacement materials. First, shut off the water supply and inspect the water inlet valve.