Tunzes have alarms that indicate that the impeller is blocked. Ie. if you hear an audible electronic wail then it means the impeller cannot turn (or is having problems turning). Usually a calcium buildup is the cause. I would not expect this out of the box, that is a little disconcerting. I would take out the impeller and see if there's anything amiss.
If you like, I could come over and take a look. Shoot me a PM if you want.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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