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I'm not sure what screen you checked, but there is a disposal screen down below inside the sump that can get clogged causing this problem. Either this screen is clogged or the main circulation pump is just going bad and not creating the pressure needed so the circulation pump will need to be replaced. Below is a link to a video that shows you how to access and clean the disposal screen in case this is not the screen you tried to clean yet. If it's clean and it still won't pump properly, you need to replace the circulation pump.
CLICK HERE for video
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Hello again. I'm just following up because I haven't heard back from you and I see this question is still open. Is there anything else I can help you with?