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It sounds like you have already done quite a bit of investigating which is good. Now you will want to replace that drain hose that comes directly off the drain pump because there is a back flow preventer inside this hose that failed all the time stopping the dishwasher from draining very well or at all. You can try to stick a flat head screwdriver through that 90 degree angle to get the backflow preventer un-stuck if you wanted to try that as well. Sometimes that will get the flap working again.If for some reason that drain hose with the 90 degree elbow doesn't fix the problem, then your drain pump is just not producing the pressure needed to drain properly all the time and the drain pump would need to be replaced. This is really not common or likely but just in case the drain hose replacement doesn't fix the issue then that would be your next step.
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It's there, it's not really a flap so much as 2 rubber bubbles that push against each other to prevent the water from flowing backwards. Either way as I stated before you just need to stick a flat head screwdriver as far as it will go through that 90 degree elbow and then try again. If it still doesn't drain just replace that drain hose.
Yes, that's all normal. It will turn on and off to purge the water in the beginning. So if it's not draining and you're sure it's clear, then I'd replace the pump. It's not common for the pump to fail but I'm not there so I can't confirm it's clear, but if it is then you need to replace the pump.
No, I'm saying that the drain line from the pump to the bottom of your sink is clear---that is what I'm saying is clear.
If something was hitting the impeller you'd hear it. Nothing inside the pump cavity itself would block the unit from draining.
Hello again. I'm just following up because I haven't heard back from you and I see this question is still open and unrated. Is there anything else I can help you with?