Roger,
I came home to find my almost new Tunze 6100 in alarm. I unplugged the pump and checked everything out. I found there was an obstruction in the impeller well. I don't know how the internals of the Tunze work but it looks like something internally got jammed and tried to protrude through the impeller well. I guess the best thing to do is post some pictures.
http://reefcentral.com/gallery/data/500/75488Tunze_001.jpg
http://reefcentral.com/gallery/data/500/75488Tunze_002.jpg
http://reefcentral.com/gallery/data/500/75488Tunze_003.jpg
http://reefcentral.com/gallery/data/500/75488Tunze_004.jpg
http://reefcentral.com/gallery/data/500/75488Tunze_005.jpg
http://reefcentral.com/gallery/data/500/75488Tunze_006.jpg
http://reefcentral.com/gallery/data/500/75488Tunze_007.jpg
I came home to find my almost new Tunze 6100 in alarm. I unplugged the pump and checked everything out. I found there was an obstruction in the impeller well. I don't know how the internals of the Tunze work but it looks like something internally got jammed and tried to protrude through the impeller well. I guess the best thing to do is post some pictures.
http://reefcentral.com/gallery/data/500/75488Tunze_001.jpg
http://reefcentral.com/gallery/data/500/75488Tunze_002.jpg
http://reefcentral.com/gallery/data/500/75488Tunze_003.jpg
http://reefcentral.com/gallery/data/500/75488Tunze_004.jpg
http://reefcentral.com/gallery/data/500/75488Tunze_005.jpg
http://reefcentral.com/gallery/data/500/75488Tunze_006.jpg
http://reefcentral.com/gallery/data/500/75488Tunze_007.jpg