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Clean out the impeller as suggested, but if it's like my Marineland Emperor HOB filters, they shut-off for a short period when run dry. I found that out accidently 2 times before by whole aquarium hobby lifetime I had them. I guess it's an overheat failure they put in that whey you run them dry, they shut off so they don't overheat. Give it 5 minutes or so to allow it to cool down and run it again, but make sure it's primed.
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