I am leasing a house with a one year old Frigidaire "Professional" series dishwasher. I own a plumbing company and have checked the drain routing and made sure the knockout is removed at the dishwsher. There isno air -gap. It will not drain. I have run it through multiple cycles with the same dishes and the drainwater is filthy. It did go into a discharge cylcle related to nothing I believe I did and empty last night, further bewildering me. I can find not model numbers. Is there a reset perhaps?