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Number 325 in the picture is the drain pump. Number 328 is a check valve that is usually the cause of drain issues. You will need to pull the dishwasher out of the cabinet to access these parts.
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Upon following your advice/information, I pulled a bread bag twist tie out of the check valve and reassembled things. The twist tie didn't seem like it could have kept the check valve open very far, if at all, considering the way it was positioned. But, that appeared to take care of the problem as the dishwasher drained/pumped the water out, and so I paid you---I thought. Later, I received your email about only paying a deposit and needing to accept your answer for you to receive payment.
However, after running 2 or 3 loads in the dishwasher, the same problem appears to have returned. Today, I finally had time to inspect the check valve again and there appears to be no obstruction of any type to remove. The check valve is nothing more than a circular, rubber flap---if I'm looking at the right part. Do you have any other suggestions as to what else might be causing the problem? My dishwasher is pulled out and laying on it's side on the floor waiting for fixing. My wife is threatening to boycott manual dishwashing, so I need to make something else clean dishes---me or the dishwasher. I'll be waiting for your suggestions.
I took the two hoses apart and did a visual inspection and could not see anything. I put my mouth on the hose and blew. The check valve closed/sealed and air did not go through, as expected. I turned to the other hose and blew the standing water in the hose out into the sink drain. Finally, I blew on the other end of the hose by the drain pump and the air came through the check valve (#464) without any problems. All appears to be fine with the hoses and check valves from the drain pump to the sink drain. Any other suggestions?
It is definately NOT back flowing from the sink, and we have no disposal. The impeller does not spin on the motor shaft. When I spin the impeller, I can feel the resistance from the motor. It feels like a spring is attached. After turning the impeller past the "mid-point" (about 1/4 turn) it springs forward another 1/4 turn and stops. I assume this is normal operation.
The last load of dishes ran and I opened the dishwasher door shortly after it was done. I noticed the water standing at the bottom. I then ran the rinse cylce again. I could hear the water spraying around inside. When the cycle ended, I could hear a buzzing/humming sound but there was no sound of water flowing/pumping/draining away. This is exactlyl what it did the first time. Is it possible there is something wrong with the motor on the drain pump? A bad spot on the brushes or rotor? This might explain why it ran a few times after the first inpection---it just happened to stop on the bad spot and wouldn't run again??? I would guess those little motors last a long time and it isn't likely that this one burned out. How would I test/run the motor to find out?