Marty, just unplug it let it cool then empty it/drain it, you may need to clean the impeller. Put water back in, don't put the U tube on though, plug it in and if the impeller runs great if not, stick something like a bamboo skewer in there and just give the impeller a budge. Put it all together and you should be fine. I used to have that problem with aqua clears all the time.
Doug
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