Tunze 9011 Works great until I .....

Your impeller is correct, the original poster had the much larger 50Hz impeller. I would send in the pump, I am at a bit of a loss as to what could be wrong. Possibly if you gave me more detail as to what it is doing I could diagnose it.
 
I got it used cleaned it up with vinegar and ran it . First week it worked like a champ. I turned it off to move some stuff around and since then it only fizzes a tiny amount of bubbles. Tried everything to get it going again and theres no foam production at all. Water line is like 1/2 inch below the line
 
OK, I think it may be the pump is spinning backwards, this was a possible defect on very early units from 2009/2010. Can you send me the pump? If it is spinning backwards, if you plug it in and unplug it eventually you may get it spinning the right way but the sensor that corrects the direction is defective when this happens, it should always spin the right way.
 
From testing it, it seems to spin backwards about 1 in 10 times, can you PM me when and where you bought it?
 
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