Have you tried running in it in a bucket full of vinegar and then giving it a thorough cleaning?
is the pump hot when it shuts off? make sure to clean out the inner part of the impeller it cools the pump. Also make sure to remove the impeller seats and assemble in outside the pump before you reinstall in.
have you swapped out both the Driver and transformer? and checked all the connections? if so you Might post over on RC and ask roger
http://reefcentral.com/forums/forumdisplay.php?f=92
Well unfortunately I found the problem it's the control box itself 7240.27 Tunze hasn't made them in a few years and very hard to find if someone has one kickin around please let me know thank you
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